function makeHttpRequest(url, callback_function, return_xml)
{
   var http_request = false;

   if (window.XMLHttpRequest) { // Mozilla, Safari,...
       http_request = new XMLHttpRequest();
       if (http_request.overrideMimeType) {
           http_request.overrideMimeType('text/xml');
       }

   } 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('Unfortunatelly you browser doesn\'t support this feature.');
       return false;
   }
   http_request.onreadystatechange = function() {
       	if (http_request.readyState == 1) {
       		preloader = document.getElementById('ajax');
       		var message = 'Procesando';
			preloader_code = '<table border="0" width="100%" height="200" bgcolor="#e6e7e8"><tr><td align="center" valign="middle"><img src="../images/ajax-loader.gif" vspace="8"><br>'+message+'</td></tr></table>';
       		preloader.innerHTML = preloader_code;
       	}
   		else if (http_request.readyState == 4) {
           if (http_request.status == 200) {
               if (return_xml) {
                   eval(callback_function + '(http_request.responseXML)');
               } else {
                   eval(callback_function + '(http_request.responseText)');
               }
           } else {
               alert('There was a problem with the request.(Code: ' + http_request.status + ')');
           }
       }
   }
   http_request.open('GET', url, true);
   http_request.send(null);
}

function loadBody(text)
{
    var html_content = text;
    document.getElementById('ajax').innerHTML = html_content;
}