var xmlHttp

function pagination(page)
{
	
xmlHttp=GetXmlHttpObject();
if (xmlHttp==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  }
var url="learning_sub.php";
url = url+"?starting="+page;
var material=document.getElementById("material").value;
var category=document.getElementById("category").value;
var title=document.getElementById("title").value;
var author=document.getElementById("author").value;
//var topic=document.getElementById("topic").value;
//url = url+"&material="+material+"&category="+category+"&title="+title+"&author="+author+"&topic="+topic;
url = url+"&material="+material+"&category="+category+"&title="+title+"&author="+author;
url=url+"&sid="+Math.random();
xmlHttp.onreadystatechange=stateChanged;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
} 

function stateChanged() 
{ 
if (xmlHttp.readyState==4)
{ 
document.getElementById("page_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;
}