function ajaxFunction(page_name, window_id, tno, fname){	
	var ajaxRequest;  
	var word="";

	var confdelete = true;
	if (confdelete){
		try{
			// Opera 8.0+, Firefox, Safari
			ajaxRequest = new XMLHttpRequest();
		} catch (e){
			// Internet Explorer Browsers
			try{
				ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
			} catch (e) {
				try{
					ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
				} catch (e){
					alert("An error occured. Please try later!");
					return false;
				}
			}
		}
		showmessage = function(){
			switchMenu('a'+window_id);
		}
		ajaxRequest.onreadystatechange = function(){
			if(ajaxRequest.readyState == 4){
				var ajaxDisplay = document.getElementById('a'+window_id);
				ajaxDisplay.innerHTML = ajaxRequest.responseText;
			}
		}

		var queryString = "?fname=" + fname + "&window_id=" + window_id + '&chreq=' + Math.random();

		document.getElementById('a'+window_id).innerHTML="<img src='../site_images/ajax_load.gif'>";
		ajaxRequest.open("GET", page_name + ".php" + queryString, true);
		ajaxRequest.send(null); 
		var i=1;
		for (i=1;i<=tno;i++){
			if (i != window_id){
				document.getElementById('a'+i).innerHTML = "";
				el = document.getElementById(i);
				el.style.display = 'none';
			}
		}
	}else{
		return false;
	}
}