function logoChangeType() {
	var xmlHttp = createxmlHttp();
	var obj = fetch_object('logodisplayhomebl');
	var obj1 = fetch_object('logochange');
	var url = "ajax_logo.php?grid="+obj1.value;
		xmlHttp.open("GET",url);
				xmlHttp.onreadystatechange = function(){
					if(xmlHttp.readyState == 1 || xmlHttp.readyState == 2){
						obj1.disabled = true;
						obj.innerHTML = '<center><img border="0" src="images/loading.gif"></center>';
					}
					else if(xmlHttp.readyState == 4 && xmlHttp.status == 200){
						var response = xmlHttp.responseText;
						obj.innerHTML = response;
						obj1.disabled = false;
				}
			}
				xmlHttp.send(null);
}