var xmlHttp
function fetchJoke(str)
{ 
	xmlHttp=GetXmlHttpObject()
	if (xmlHttp==null)
	 {
		 alert ("Browser does not support HTTP Request");
		 return;
	 } 
	var url="fetch.php";
	url=url+"?id="+str;
	url=url+"&sid="+Math.random();
	xmlHttp.onreadystatechange=stateChanged ;
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
}

function stateChanged() 
{ 
	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
	 { 
		document.getElementById("Contents").innerHTML=xmlHttp.responseText 
	 } 
}

function GetXmlHttpObject()
{
	var xmlHttp=null;
	try
 	{
	 // Firefox, Opera 8.0+, Safari
	 	xmlHttp=new XMLHttpRequest();
	 }
	catch (e)
	 {
	 //Internet Explorer
		try
		{
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (e)
		{
			xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
		}
	 }
	return xmlHttp;
}