function update_cart_amount(strURL) {
	
	if (window.XMLHttpRequest) {
		
		xmlhttp = new XMLHttpRequest();
  	
	} else {
		
		xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
  	
	}
	
	xmlhttp.onreadystatechange=function() {
 
 		if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
	
			// do nothing here
    	
		}
  	}

	xmlhttp.open("GET", strURL, true);
	xmlhttp.send();

}