var http_request = false;
   function alertContents(http_request,requ) {
   }
   

   function makePOSTRequest(url, parameters, requ) {
      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 = function(){

      if (http_request.readyState == 4) {
         if (http_request.status == 200) {
            result = http_request.responseText;
		switch(requ){
		   case 'changepic':
		      var arr = result.split('&&&');
		      document.getElementById('s1').innerHTML=arr[0];
		      document.getElementById('s2').innerHTML=arr[1];
		      document.getElementById('s3').innerHTML=arr[2];
		   break;
		}
            
         }
      }

	}
      http_request.open('POST', url, true);
      http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
      http_request.setRequestHeader("Content-length", parameters.length);
      http_request.setRequestHeader("Connection", "close");
      http_request.send(parameters);
   }