var xmlhttp;

String.prototype.trim = function () {
return this.replace(/^\s*|\s*$/,"");
}

function addBook(id)
{
xmlhttp=GetXmlHttpObject();
if (xmlhttp==null)
  {
  alert ("Browser does not support HTTP Request");
  return;
  }
var url="cart_add.php";
url=url+"?id="+id;
xmlhttp.onreadystatechange=stateChanged;
xmlhttp.open("GET",url,true);
xmlhttp.send(null);
}

function calc_cart()
{
xmlhttp=GetXmlHttpObject();
if (xmlhttp==null)
  {
  alert ("Browser does not support HTTP Request");
  return;
  }
var url="calc_cart.php";
xmlhttp.onreadystatechange=modifyStateChanged;
xmlhttp.open("GET",url,true);
xmlhttp.send(null);
}

function editBook(id, value)
{
	//alert(id+"   "+value);
xmlhttp=GetXmlHttpObject();
if (xmlhttp==null)
  {
  alert ("Browser does not support HTTP Request");
  return;
  }
var url="edit_cart.php";
var el = document.getElementById("icount_"+id);
//alert(el);
if (el.value != parseInt(el.value))
{
alert("Cantitate incorecta");
el.value="1";
window.location = "process_cart.php";
return;
}
if (el.value=="0")
{
	alert("Cantitate incorecta...");
	window.location = "process_cart.php";
	return;
}
url=url+"?id="+id+"&value="+el.value;
xmlhttp.onreadystatechange=editStateChanged;
xmlhttp.open("GET",url,true);
xmlhttp.send(null);
}

function stateChanged()
{
if (xmlhttp.readyState==4)
{
alert(xmlhttp.responseText);
}
}

function editStateChanged()
{
if (xmlhttp.readyState==4)
{
	if (xmlhttp.responseText=="error")
	{
		alert("Eroare la modificarea produsului...");	
	}
	else
	{
		var pa=xmlhttp.responseText.split(":");
		var name = new String(pa[0]);
		var el = document.getElementById("total_"+name.trim());
		//alert(xmlhttp.responseText);
		el.innerHTML=pa[1];
		calc_cart();
	}
}
}

function modifyStateChanged()
{
if (xmlhttp.readyState==4)
{
	if (xmlhttp.responseText=="error")
	{
		alert("Eroare la modificarea produsului...")	
	}
	else
	{
		var el = document.getElementById("tot_cart");
		el.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;
}