function changeCatType(type,refURL)
{
var xmlhttp=false; //Clear our fetching variable
        try {
                xmlhttp = new ActiveXObject('Msxml2.XMLHTTP'); //Try the first kind of active x object.
        } catch (e) {
                try {
                        xmlhttp = new
                        ActiveXObject('Microsoft.XMLHTTP'); //Try the second kind of active x object
            } catch (E) {
                xmlhttp = false;
                        }
        }
        if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
                xmlhttp = new XMLHttpRequest(); //If we were able to get a working active x object, start an XMLHttpRequest
        }
       

		var file = 'session.php?type='+type+'&math='+Math.random(); //This is the path to the file we just finished making *
		//alert(file);
    
	xmlhttp.open('GET', file, true); //Open the file through GET, and add the page we want to retrieve as a GET variable **
 
	xmlhttp.onreadystatechange=function() {
        if (xmlhttp.readyState==4) { //Check if it is ready to recieve data
                var content = xmlhttp.responseText; //The content data which has been retrieved ***
                if( content ){ //Make sure there is something in the content variable
                     
					  window.location=refURL;
					  //document.getElementById(containerId).innerHTML = content; //Change the inner content of your div to the newly retrieved content ****
                     
					 
				}
        }
     }
    xmlhttp.send(null) //Nullify the XMLHttpRequest
return;
}