var http_request = false;
   var ajax_dest = 'cal_data';
   var processing = false;
   
   function makeRequest(url, parameters) {
      http_request = false;
      if (window.XMLHttpRequest) { // Mozilla, Safari,...
         http_request = new XMLHttpRequest();
         if (http_request.overrideMimeType) {
         	// set type accordingly to anticipated content type
            //http_request.overrideMimeType('text/xml');
            http_request.overrideMimeType('text/html');
         }
      } else if (window.ActiveXObject) { // IE
         try {
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
         } catch (e) {
            try {
               http_request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {}
         }
      }
      if (!http_request) {
         alert('Cannot create XMLHTTP instance');
         return false;
      }
      http_request.onreadystatechange = alertContents;
      http_request.open('GET', url + parameters, true);
      http_request.send(null);
   }

   function alertContents() {
      if (http_request.readyState == 4) {
         if (http_request.status == 200) {
            //alert(http_request.responseText);
            result = http_request.responseText;
            document.getElementById(ajax_dest).innerHTML = result;            
			processing = false;
         } else {
			processing = false;
            alert('There was a problem with the request.');
         }
      }
   }
   
   function display_day(city, day)
   {
   		if (!processing)
		{
			processing = true;
			ajax_dest = 'cal_data';
			document.getElementById(ajax_dest).innerHTML = '<div align="center"><img src="/templates/default/images/calwaiting.gif"></div>'; 
			makeRequest('/get_ajax.php', '?mode=cal&city='+city+'&day='+day);
		}
		return false;
   }