var RequestResponseText;
		var RequestResponseXML;
		var HTTP_Request=false;
		
		function crearRequestObject() // funcio per crear objecte per fer crides assincrones al servidor
		{
			if(navigator.appName == "Microsoft Internet Explorer")
			{
				  try
				    {
				    	HTTP_Request=new ActiveXObject("Msxml2.XMLHTTP");
				    }
				  catch (e)
				    {
				    	HTTP_Request=new ActiveXObject("Microsoft.XMLHTTP");
				    }
			}
			else
			{
				HTTP_Request=new XMLHttpRequest();
				HTTP_Request.overrideMimeType('text/xml');				
			}
		}
		
		crearRequestObject();	
		
		function handleRequest()
		{
			if((HTTP_Request.readyState == 4)&&(HTTP_Request.status == 200))
			{ 
				RequestResponseXML=HTTP_Request.responseXML;			
			}
		}