var xmlhttp;

function updateUser(recalculate,number_products)
{

var form_name="frm_cart";

 xmlhttp=GetXmlHttpObject();
if (xmlhttp==null)
  {
  alert ("Browser does not support HTTP Request");
  return;
  }
var quantity = new Array();  
for(i=0; i<number_products; i++)
{
quantity[i]=document.forms[form_name].elements[i].value;
if(i==0)
{
var quan=quantity[i];
}else
{
var quan=quan+";"+quantity[i];
}
}
var productcode = new Array(); 
for(i=1; i<=number_products; i++)
{
productcode[i]=document.getElementById("prod_code["+i+"]").value;

if(i==1)
{
var code=productcode[i];
}else
{
var code=code+";"+productcode[i];
}
}

var url="shopjs.php";
if(recalculate=='update')
{ 
url=url+"?txt_quantity="+quan+"&recode="+code+"&txt_mode=recalculate_order";
}
xmlhttp.onreadystatechange=stateChanged;
xmlhttp.open("GET",url,true);
xmlhttp.send(null);
}

function stateChanged()
{
	if (xmlhttp.readyState==4)
	{
	//document.getElementById("image").innerText="";
	//alert("OutPut==="+xmlhttp.responseText);
	document.getElementById("shop").innerHTML=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;
}