var xmlHttp_cc

function cartridgeCart(action,id_cartridge,id_agent)
{ 
if (action=='add'){
	var ID=document.getElementById('qty_'+id_cartridge);
	var qty=ID.value;	
}else{
	var qty=0;
}
var ID2=document.getElementById('your_postcode');
if (id_agent=='' || ID2){
	var your_postcode=ID2.value;
}else{
	var your_postcode='';
}
	
xmlHttp_cc=GetXmlHttpObject()

if (xmlHttp_cc==null)
 {
 alert ("Browser does not support HTTP Request")
 return
 }
var url="cartridge_cart.php"
url=url+"?id_cartridge="+id_cartridge
url=url+"&action="+action
url=url+"&qty="+qty
url=url+"&id_agent="+id_agent
url=url+"&your_postcode="+your_postcode
url=url+"&sid="+Math.random();
xmlHttp_cc.onreadystatechange=stateChanged_cc 
xmlHttp_cc.open("GET",url,true)
xmlHttp_cc.send(null)
}

function stateChanged_cc() 
{ 
if (xmlHttp_cc.readyState==4 || xmlHttp_cc.readyState=="complete")
 { 
 document.getElementById("cartridge_cart").innerHTML=xmlHttp_cc.responseText;
 } 
}