//Ajax functions
//w3schools.com
function GetXmlHttpObject(){
	var xmlHttp=null;
  	try{
		// Firefox, Opera 8.0+, Safari
		xmlHttp=new XMLHttpRequest();
	}
  	catch (e){
    // Internet Explorer
		try{
		  xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		}
    	catch (e){
		  xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
		}
    }
  	
	return xmlHttp;
} 

function genEngine(){
	
	var year = document.getElementById("year").value;
	var make = document.getElementById("make").value;
	var model = document.getElementById("model").value;
	var submodel = document.getElementById("submodel").value;
	var sc1 = document.getElementById("sc1").value;
	var sc2 = document.getElementById("sc2").value;
	var sc3 = document.getElementById("sc3").value;
	var sc4 = document.getElementById("sc4").value;
	//var district = document.getElementById("district").value;
	
	//alert(district);
	/*if (submodel == 0){ 
		toEngine = "<select name='engine' id='engine'><option value='0'>Select Engine</option></select>";
		toCat = "<select name='categ' id='categ'><option value='0'>Select Category</option></select>";
		
		document.getElementById("engine_here").innerHTML="<span id='engine_here'>"+toEngine+"</span>";
		document.getElementById("cat_here").innerHTML="<span id='cat_here'>"+toCat+"</span>";
		return;
  	}*/
	
		toEngine = "<select name='engine' id='engine'><option value='0'>Select Engine</option></select>";
		//toCat = "<select name='categ' id='categ'><option value='0'>Select Category</option></select>";
		
		document.getElementById("engine_here").innerHTML="<span id='engine_here'>"+toEngine+"</span>";
		//document.getElementById("cat_here").innerHTML="<span id='cat_here'>"+toCat+"</span>";
		
		document.getElementById("engine").value= 0;
		document.getElementById("categ").value= 0;
	
	xmlHttpx5=GetXmlHttpObject()
	if (xmlHttpx5==null){
  		alert ("Your browser does not support AJAX! \nThis page may not work properly.");
  		return;
  	} 
	
	var url="gen_engine_cat.php";
	url=url+"?year="+year;
	url=url+"&make="+make;
	url=url+"&model="+model;
	url=url+"&submodel="+submodel;
	url=url+"&sc1="+sc1;
	url=url+"&sc2="+sc2;
	url=url+"&sc3="+sc3;
	url=url+"&sc4="+sc4;
	//url=url+"&district="+district;
	url=url+"&sid="+Math.random();
	xmlHttpx5.onreadystatechange=function() { 
		if (xmlHttpx5.readyState==4){ 
			document.getElementById("engine_here").innerHTML=xmlHttpx5.responseText;
		}
	};
	xmlHttpx5.open("GET",url,true);
	xmlHttpx5.send(null);
	
}