//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 getMakeOptions(){
	
	var category = document.getElementById("category").value;
	
	xmlHttp=GetXmlHttpObject()
	if (xmlHttp==null){
  		alert ("Your browser does not support AJAX! \nThis page may not work properly.");
  		return;
  	} 

	var url="getMakeOptions.php";
	url=url+"?sid="+Math.random();
	url=url+"&category="+category;
	//alert(url);
	xmlHttp.onreadystatechange=function() { 
		if (xmlHttp.readyState==4){ 
			document.getElementById("make_here").innerHTML = xmlHttp.responseText;
			//document.getElementById("CG_label").innerHTML="<span id='CG_label'>Commodity Group</span>";
		}
	};
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
	
}