var makesArray = [[9,"Chevrolet"],[10,"Chrysler"],[11,"Dodge"],[1,"Ford"],[14,"GMC"],[15,"Honda"],[16,"Hyundai"],[18,"Jeep"],[2,"Lincoln"],[20,"Mazda"],[21,"Nissan"],[24,"Pontiac"],[28,"Toyota"],[29,"Volkswagen"]];
var modelsArray = [[674,20,"3"],[307,15,"Accord"],[175,9,"Aveo"],[177,9,"Blazer"],[491,28,"Camry"],[240,11,"Caravan"],[631,9,"Cobalt"],[493,28,"Corolla"],[248,11,"Durango"],[646,1,"Edge"],[321,16,"Elantra"],[8,1,"Escape"],[13,1,"Explorer"],[14,1,"Explorer Sport Trac"],[16,1,"F150"],[17,1,"F250"],[18,1,"F350"],[706,1,"Fiesta "],[667,1,"Flex"],[21,1,"Focus"],[612,1,"Fusion"],[678,1,"Fusion Hybrid"],[521,29,"Golf"],[732,9,"K1000"],[193,9,"Malibu"],[601,2,"MARK LT"],[670,2,"MKS"],[690,2,"MKT"],[440,24,"Montana"],[24,1,"Mustang"],[709,1,"Mustang Shelby"],[41,2,"Navigator"],[233,10,"PT Cruiser"],[27,1,"Ranger"],[393,21,"Sentra"],[582,14,"Sierra"],[591,9,"Silverado"],[633,11,"SX"],[28,1,"Taurus"],[600,18,"TJ"],[664,9,"Uplander"],[675,21,"Versa"],[637,21,"X-Trail"]];

function UpdateModels(makeIdentifier) {

	// Update models when a make is selected by the visitor
	modelObject = document.searchForm.ModelID;
	modelObject.options[0] = new Option();
	modelObject.options[0].value = "";
	modelObject.options[0].text = "Any Model";
	modelObject.selectedIndex = 0;

	var makeObject = document.searchForm.MakeID;
	var makeIdentifier = makeObject.options[makeObject.selectedIndex].value;

	var counter = 1;
	if(makeIdentifier != "") {
		for(var i = 0; i < modelsArray.length; i++) {
			if(modelsArray[i][1] == makeIdentifier) {
				modelObject.options[counter] = new Option();
				modelObject.options[counter].value = modelsArray[i][0];
				modelObject.options[counter].text = modelsArray[i][2];
				counter++;
			}
		}
	}

	modelObject.length = counter;
}

var PrevOnLoadFunction;

function SetupSearchForm() {

	// Call previously installed onload handler
	if(PrevOnLoadFunction) {
		PrevOnLoadFunction();
	}

	// Populate the make select box
	var makeObject = document.searchForm.MakeID;
	makeObject.onchange = UpdateModels;
	makeObject.options[0] = new Option();
	makeObject.options[0].value = "";
	makeObject.options[0].text = "Any Make";
	for(var i = 0; i < makesArray.length; i++) {
		makeObject.options[i+1] = new Option();
		makeObject.options[i+1].value = makesArray[i][0];
		makeObject.options[i+1].text = makesArray[i][1];
	}
	makeObject.length = makesArray.length + 1;
	makeObject.selectedIndex = 0;

	// Populate the model select box
	var modelObject = document.searchForm.ModelID;
	modelObject.options[0] = new Option();
	modelObject.options[0].value = "";
	modelObject.options[0].text = "Any Model";
	modelObject.length = 1;
	modelObject.selectedIndex = 0;
}

PrevOnLoadFunction = window.onload;
window.onload = SetupSearchForm;