// declare a global  XMLHTTP Request object
var XmlHttpObj;

// create an instance of XMLHTTPRequest Object, varies with browser type, try for IE first then Mozilla
function CreateXmlHttpObj()
{
	// try creating for IE (note: we don't know the user's browser type here, just attempting IE first.)
	try
	{
		XmlHttpObj = new ActiveXObject("Msxml2.XMLHTTP");
	}
	catch(e)
	{
		try
		{
			XmlHttpObj = new ActiveXObject("Microsoft.XMLHTTP");
		} 
		catch(oc)
		{
			XmlHttpObj = null;
		}
	}
	// if unable to create using IE specific code then try creating for Mozilla (FireFox) 
	if(!XmlHttpObj && typeof XMLHttpRequest != "undefined") {
		XmlHttpObj = new XMLHttpRequest();
	}
}

function getModel(makeListId)
{
	//alert(makeListId);return false;
	makeListFormId = makeListId;
	var makeList = document.getElementById(makeListId);
	var selectedMake = makeList.options[makeList.selectedIndex].value;
	var requestUrl;
	requestUrl = "xml_data_provider.php" + "?makeID=" + encodeURIComponent(selectedMake);
	//alert(requestUrl);return false;
	CreateXmlHttpObj();
	if(XmlHttpObj) {
        // assign the StateChangeHandler function ( defined below in this file)
        // to be called when the state of the XmlHttpObj changes
        // receiving data back from the server is one such change
		XmlHttpObj.onreadystatechange = StateChangeHandler;
		
		// define the iteraction with the server -- true for as asynchronous.
		XmlHttpObj.open("GET", requestUrl, true);
		
		// send request to server, null arg  when using "GET"
		XmlHttpObj.send(null);		
	}
}
function getModel_a(makeListId)
{
	//alert(makeListId);return false;
	makeListFormId = makeListId;
	var makeList = document.getElementById(makeListId);
	var selectedMake = makeList.options[makeList.selectedIndex].value;
	var requestUrl;
	requestUrl = "xml_data_provider.php" + "?makeID=" + encodeURIComponent(selectedMake);
	//alert(requestUrl);return false;
	CreateXmlHttpObj();
	if(XmlHttpObj) {
        // assign the StateChangeHandler function ( defined below in this file)
        // to be called when the state of the XmlHttpObj changes
        // receiving data back from the server is one such change
		XmlHttpObj.onreadystatechange = StateChangeHandler_a;
		
		// define the iteraction with the server -- true for as asynchronous.
		XmlHttpObj.open("GET", requestUrl, true);
		
		// send request to server, null arg  when using "GET"
		XmlHttpObj.send(null);		
	}
}
function getCol(modelSideList)
{
	//alert(modelSideList);return false;
	modelListFormId = modelSideList;
	var modelList = document.getElementById(modelSideList);
	var selectedModel = modelList.options[modelList.selectedIndex].value;
	var requestUrl;
	requestUrl = "xml_data_provider.php" + "?modelID=" + encodeURIComponent(selectedModel);
	//alert(requestUrl);return false;
	CreateXmlHttpObj();
	if(XmlHttpObj) {
        // assign the StateChangeHandler function ( defined below in this file)
        // to be called when the state of the XmlHttpObj changes
        // receiving data back from the server is one such change
		XmlHttpObj.onreadystatechange = ColChangeHandler;
		
		// define the iteraction with the server -- true for as asynchronous.
		XmlHttpObj.open("GET", requestUrl, true);
		
		// send request to server, null arg  when using "GET"
		XmlHttpObj.send(null);		
	}
}

function getEng(colorList,modellst,makelst)
{
	var makelist = document.getElementById(makelst).value;
	var modellist = document.getElementById(modellst).value;
	//alert(modelSideList);return false;
	colListFormId = colorList;
	var colList = document.getElementById(colorList);
	var selectedCol = colList.options[colList.selectedIndex].value;
	var requestUrl;
	requestUrl = "xml_data_provider.php" + "?makeid="+makelist+"&modid="+modellist+"&colID=" + encodeURIComponent(selectedCol);
	
	CreateXmlHttpObj();
	if(XmlHttpObj) {
       
		XmlHttpObj.onreadystatechange = EngChangeHandler;
		
		XmlHttpObj.open("GET", requestUrl, true);
		
		XmlHttpObj.send(null);		
	}
}
function getDoor(engList,modellst,makelst,colst)
{
	var makelist = document.getElementById(makelst).value;
	var modellist = document.getElementById(modellst).value;
	var colst = document.getElementById(colst).value;
	//alert(modelSideList);return false;
	engListFormId = engList;
	var engList = document.getElementById(engList);
	var selectedEng = engList.options[engList.selectedIndex].value;
	var requestUrl;
	requestUrl = "xml_data_provider.php" + "?colst="+colst+"&makeid="+makelist+"&modid="+modellist+"&engID=" + encodeURIComponent(selectedEng);
	
	CreateXmlHttpObj();
	if(XmlHttpObj) {
       
		XmlHttpObj.onreadystatechange = DorChangeHandler;
		
		XmlHttpObj.open("GET", requestUrl, true);
		
		XmlHttpObj.send(null);		
	}
}
function getYears(dorList,modellst,makelst,colst,englst)
{
//alert(dorList);return false;
	var makelist = document.getElementById(makelst).value;
	var modellist = document.getElementById(modellst).value;
	var colst = document.getElementById(colst).value;
	var englst = document.getElementById(englst).value;
	
	/*alert(englst);
	return false;*/
	
	dorListFormId = dorList;
	var dorList = document.getElementById(dorList);
	var selectedDor = dorList.options[dorList.selectedIndex].value;
	var requestUrl;
	requestUrl = "xml_data_provider.php" + "?englst="+englst+"&colst="+colst+"&makeid="+makelist+"&modid="+modellist+"&dorID=" + encodeURIComponent(selectedDor);
	
	/*alert(requestUrl);
	return false;*/
	
	CreateXmlHttpObj();
	if(XmlHttpObj) {
       
		XmlHttpObj.onreadystatechange = TransChangeHandler;
		
		XmlHttpObj.open("GET", requestUrl, true);
		
		XmlHttpObj.send(null);		
	}
}
/*function getYears(transList,modellst,makelst,colst,englst,doorlst)
{
	var makelist = document.getElementById(makelst).value;
	var modellist = document.getElementById(modellst).value;
	var colst = document.getElementById(colst).value;
	var englst = document.getElementById(englst).value;
	var doorlst = document.getElementById(doorlst).value;
	//alert(modelSideList);return false;
	transListFormId = transList;
	var transList = document.getElementById(transList);
	var selectedTrs = transList.options[transList.selectedIndex].value;
	var requestUrl;
	requestUrl = "xml_data_provider.php" + "?dorlst="+doorlst+"&englst="+englst+"&colst="+colst+"&makeid="+makelist+"&modid="+modellist+"&transID=" + encodeURIComponent(selectedTrs);*/
	
	/*alert(requestUrl);
	return false;*/
	
	/*CreateXmlHttpObj();
	if(XmlHttpObj) {
       
		XmlHttpObj.onreadystatechange = YearsChangeHandler;
		
		XmlHttpObj.open("GET", requestUrl, true);
		
		XmlHttpObj.send(null);		
	}
}*/

// this function called when state of  XmlHttpObj changes
// we're interested in the state that indicates data has been
// received from the server
function StateChangeHandler()
{
	// state ==4 indicates receiving response data from server is completed
	if(XmlHttpObj.readyState == 4) {
		// To make sure valid response is received from the server, 200 means response received is OK
		if(XmlHttpObj.status == 200) {
			populateModelList(XmlHttpObj.responseXML.documentElement);
		} else {
			alert("problem retrieving data from the server, status code: "  + XmlHttpObj.status);
		}
	}
}
function StateChangeHandler_a()
{
	// state ==4 indicates receiving response data from server is completed
	if(XmlHttpObj.readyState == 4) {
		// To make sure valid response is received from the server, 200 means response received is OK
		if(XmlHttpObj.status == 200) {
			populateModelList_a(XmlHttpObj.responseXML.documentElement);
		} else {
			alert("problem retrieving data from the server, status code: "  + XmlHttpObj.status);
		}
	}
}

function ColChangeHandler()
{
	// state ==4 indicates receiving response data from server is completed
	if(XmlHttpObj.readyState == 4) {
		// To make sure valid response is received from the server, 200 means response received is OK
		if(XmlHttpObj.status == 200) {
			populateColList(XmlHttpObj.responseXML.documentElement);
		} else {
			alert("problem retrieving data from the server, status code: "  + XmlHttpObj.status);
		}
	}
}
function EngChangeHandler()
{
	// state ==4 indicates receiving response data from server is completed
	if(XmlHttpObj.readyState == 4) {
		// To make sure valid response is received from the server, 200 means response received is OK
		if(XmlHttpObj.status == 200) {
			populateEngList(XmlHttpObj.responseXML.documentElement);
		} else {
			alert("problem retrieving data from the server, status code: "  + XmlHttpObj.status);
		}
	}
}

function DorChangeHandler()
{
	// state ==4 indicates receiving response data from server is completed
	if(XmlHttpObj.readyState == 4) {
		// To make sure valid response is received from the server, 200 means response received is OK
		if(XmlHttpObj.status == 200) {
			populateDorList(XmlHttpObj.responseXML.documentElement);
		} else {
			alert("problem retrieving data from the server, status code: "  + XmlHttpObj.status);
		}
	}
}
function TransChangeHandler()
{
	// state ==4 indicates receiving response data from server is completed
	if(XmlHttpObj.readyState == 4) {
		// To make sure valid response is received from the server, 200 means response received is OK
		if(XmlHttpObj.status == 200) {
			populateTransList(XmlHttpObj.responseXML.documentElement);
		} else {
			alert("problem retrieving data from the server, status code: "  + XmlHttpObj.status);
		}
	}
}
function YearsChangeHandler()
{
	// state ==4 indicates receiving response data from server is completed
	if(XmlHttpObj.readyState == 4) {
		// To make sure valid response is received from the server, 200 means response received is OK
		if(XmlHttpObj.status == 200) {
			populateYearsList(XmlHttpObj.responseXML.documentElement);
		} else {
			alert("problem retrieving data from the server, status code: "  + XmlHttpObj.status);
		}
	}
}

// populate the contents of the dropdown list
function populateModelList(modelNode)
{
//alert(modelNode);return false;

	if(makeListFormId == 'makeSideList') {
		var modelFormId = 'modelSideList';
	} else if(makeListFormId == 'makeSearchList') {
		var modelFormId = 'modelSearchList';
	} else if(makeListFormId == 'makeIndexList') {
		var modelFormId = 'modelIndexList';
	}

	var modelid = modelNode.getElementsByTagName('modelid');
	var modelname = modelNode.getElementsByTagName('modelname');
	
	var idValue;
	var textValue; 
	var optionItem;
	//alert(modelid.length);
	var objCombo = document.getElementById(modelFormId);
	// populate the dropdown list with data from the xml doc
	objCombo.length = parseInt(modelid.length);
	for (var count = 0; count < objCombo.length; count++) {
   		objCombo[count].value = modelid.item(count).firstChild.data;
		objCombo[count].text = modelname.item(count).firstChild.data;
	}
}

function populateModelList_a(modelNode)
{
//alert(modelNode);return false;

	if(makeListFormId == 'makeSideList_a') {
		var modelFormId = 'modelSideList_a';
	} else if(makeListFormId == 'makeSearchList') {
		var modelFormId = 'modelSearchList';
	} else if(makeListFormId == 'makeIndexList') {
		var modelFormId = 'modelIndexList';
	}

	var modelid = modelNode.getElementsByTagName('modelid');
	var modelname = modelNode.getElementsByTagName('modelname');
	
	var idValue;
	var textValue; 
	var optionItem;
	//alert(modelid.length);
	var objCombo = document.getElementById(modelFormId);
	// populate the dropdown list with data from the xml doc
	objCombo.length = parseInt(modelid.length);
	for (var count = 0; count < objCombo.length; count++) {
   		objCombo[count].value = modelid.item(count).firstChild.data;
		objCombo[count].text = modelname.item(count).firstChild.data;
	}
}

function populateColList(colNode)
{
//alert(modelListFormId);return false;

	if(modelListFormId == 'modelSideList_a') {
		var colFormId = 'colorList';
	} else if(makeListFormId == 'makeSearchList') {
		var modelFormId = 'modelSearchList';
	} else if(makeListFormId == 'makeIndexList') {
		var modelFormId = 'modelIndexList';
	}

	var colid = colNode.getElementsByTagName('colid');
	var colname = colNode.getElementsByTagName('colname');
	
	var idValue;
	var textValue; 
	var optionItem;
	
	//alert(colid.length);return false;
	
	var objCombo = document.getElementById(colFormId);
	// populate the dropdown list with data from the xml doc
	objCombo.length = parseInt(colid.length);
	for (var count = 0; count < objCombo.length; count++) {
   		objCombo[count].value = colid.item(count).firstChild.data;
		objCombo[count].text = colname.item(count).firstChild.data;
	}
}
function populateEngList(engNode)
{
//alert(modelNode);return false;

	if(colListFormId == 'colorList') {
		var engFormId = 'engList';
	} else if(makeListFormId == 'makeSearchList') {
		var modelFormId = 'modelSearchList';
	} else if(makeListFormId == 'makeIndexList') {
		var modelFormId = 'modelIndexList';
	}

	var engid = engNode.getElementsByTagName('engid');
	var engname = engNode.getElementsByTagName('engname');
	
	var idValue;
	var textValue; 
	var optionItem;
	//alert(modelid.length);
	var objCombo = document.getElementById(engFormId);
	// populate the dropdown list with data from the xml doc
	objCombo.length = parseInt(engid.length);
	for (var count = 0; count < objCombo.length; count++) {
   		objCombo[count].value = engid.item(count).firstChild.data;
		objCombo[count].text = engname.item(count).firstChild.data;
	}
}
function populateDorList(dorNode)
{
//alert(modelNode);return false;

	if(engListFormId == 'engList') {
		var dorFormId = 'doorList';
	} else if(makeListFormId == 'makeSearchList') {
		var modelFormId = 'modelSearchList';
	} else if(makeListFormId == 'makeIndexList') {
		var modelFormId = 'modelIndexList';
	}

	var dorid = dorNode.getElementsByTagName('dorid');
	var dorname = dorNode.getElementsByTagName('dorname');
	
	var idValue;
	var textValue; 
	var optionItem;
	//alert(modelid.length);
	var objCombo = document.getElementById(dorFormId);
	// populate the dropdown list with data from the xml doc
	objCombo.length = parseInt(dorid.length);
	for (var count = 0; count < objCombo.length; count++) {
   		objCombo[count].value = dorid.item(count).firstChild.data;
		objCombo[count].text = dorname.item(count).firstChild.data;
	}
}
function populateTransList(transNode)
{
//alert(transNode);return false;

	if(dorListFormId == 'doorList') {
		var transFormId = 'yrList';
	} else if(makeListFormId == 'makeSearchList') {
		var modelFormId = 'modelSearchList';
	} else if(makeListFormId == 'makeIndexList') {
		var modelFormId = 'modelIndexList';
	}

	var transid = transNode.getElementsByTagName('yearid');
	var transname = transNode.getElementsByTagName('yearname');
	
	var idValue;
	var textValue; 
	var optionItem;
	
	/*alert(transid.length);
	return false;*/
	
	var objCombo = document.getElementById(transFormId);
	// populate the dropdown list with data from the xml doc
	objCombo.length = parseInt(transid.length);
	for (var count = 0; count < objCombo.length; count++) {
   		objCombo[count].value = transid.item(count).firstChild.data;
		objCombo[count].text = transname.item(count).firstChild.data;
	}
}
function populateYearsList(yearsNode)
{
//alert(modelNode);return false;

	if(transListFormId == 'transList') {
		var yearsFormId = 'yrList';
	} else if(makeListFormId == 'makeSearchList') {
		var modelFormId = 'modelSearchList';
	} else if(makeListFormId == 'makeIndexList') {
		var modelFormId = 'modelIndexList';
	}

	var yearid = yearsNode.getElementsByTagName('yearid');
	var yearname = yearsNode.getElementsByTagName('yearname');
	
	var idValue;
	var textValue; 
	var optionItem;
	//alert(modelid.length);
	var objCombo = document.getElementById(yearsFormId);
	// populate the dropdown list with data from the xml doc
	objCombo.length = parseInt(yearid.length);
	for (var count = 0; count < objCombo.length; count++) {
   		objCombo[count].value = yearid.item(count).firstChild.data;
		objCombo[count].text = yearname.item(count).firstChild.data;
	}
}