var http_request = false;
   var where = null;
   var loading = null;
   function make_request(url, parameters, to, loading_div) {
      http_request = false;
      where = to;
      
      if (loading_div != null ) {
        loading = loading_div;
      } else {
        loading = to;
      }
      
      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(loading).innerHTML = '';
            changefocus;
            document.getElementById(where).innerHTML = result;            
         } else {
            alert('There was a problem with the request.');
         }
      }
      else {
        if (typeof where == 'string' && where != '') {
          document.getElementById(loading).innerHTML = '<img src="./templates/classic/images/working.gif" alt="pracuji" style="border:none;" />';
        }
      }
   }
   
   function get(obj,file,to,parameters) {
  var getstr = "?";
  for (i=0; i<obj.getElementsByTagName("input").length; i++) {
        if (obj.getElementsByTagName("input")[i].type == "text") {
           getstr += obj.getElementsByTagName("input")[i].name + "=" + 
                   obj.getElementsByTagName("input")[i].value + "&";
        }
        if (obj.getElementsByTagName("input")[i].type == "checkbox") {
           if (obj.getElementsByTagName("input")[i].checked) {
              getstr += obj.getElementsByTagName("input")[i].name + "=" + 
                   obj.getElementsByTagName("input")[i].value + "&";
           } else {
              getstr += obj.getElementsByTagName("input")[i].name + "=&";
           }
        }
        if (obj.getElementsByTagName("input")[i].type == "radio") {
           if (obj.getElementsByTagName("input")[i].checked) {
              getstr += obj.getElementsByTagName("input")[i].name + "=" + 
                   obj.getElementsByTagName("input")[i].value + "&";
           }
     }  
     if (obj.getElementsByTagName("input")[i].tagName == "SELECT") {
        var sel = obj.getElementsByTagName("input")[i];
        getstr += sel.name + "=" + sel.options[sel.selectedIndex].value + "&";
     }
     
  }

      make_request(file, getstr + parameters,to);
   }
   
   function changefocus() {
      var this_item=document.getElementById('mnu').getElementsByTagName('a'); 
      for(var i=0;i<this_item.length;i++) {
        this_item[i].style.textDecoration ='underline';
      }
      document.getElementById(item).style.textDecoration ='none'; 
   
   }