var xmlhttp
		
		function combofunction(b,c,a)
		{
						
			
		xmlhttp=GetXmlHttpObject();
		if (xmlhttp==null)
		{
		alert ("Your browser does not support AJAX!");
		return;
		}
		var url="addtocart.php";
		url=url+"?id="+a+"&aid="+b+"&qty="+c;
		
		xmlhttp.onreadystatechange=stateChanged;
		xmlhttp.open("POST",url,true);
		xmlhttp.send(null);
		}
		
		function stateChanged()
		{
		if (xmlhttp.readyState==4)
		{
		  alert(xmlhttp.responseText)
		}
		}
		
		function GetXmlHttpObject()
		{
		if (window.XMLHttpRequest)
		{
		// code for IE7+, Firefox, Chrome, Opera, Safari
		return new XMLHttpRequest();
		}
		if (window.ActiveXObject)
		{
		// code for IE6, IE5
		return new ActiveXObject("Microsoft.XMLHTTP");
		}
		return null;
		}