String.prototype.trim = function() {
    a = this.replace(/^\s+/, '');
    return a.replace(/\s+$/, '');
};

var http_request = false;
 
function showMenu(menu)
{
  if (menu == "") {
    menu = "events";
  }

  for (var i=0; i<F4GK_menus.length; i++) {
    showTab(F4GK_menus[i], menu);
  }
}

function showTab(dispTab, selTab)
{
  if (dispTab == selTab) {
    jQuery("#tab_" + dispTab).addClass("selected");
    jQuery("#sub_" + dispTab).show();
  } else {
    jQuery("#tab_" + dispTab).removeClass("selected");
    jQuery("#sub_" + dispTab).hide();
  }
}

function clickThru(site, sitehttp)
{
  submitPostForm("/clickthru.php", "site=" + encodeURI(site), null);
  window.open(sitehttp);
}

function submitPostForm(url, parameters, stateChangeFunction) 
{
  http_request = false;
  if (window.XMLHttpRequest) // Mozilla, Safari,...
  { 
     http_request = new XMLHttpRequest();
     if (http_request.overrideMimeType) 
     {
        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 make submission from this browser.');
     return false;
  }

  http_request.onreadystatechange = stateChangeFunction;
  http_request.open('POST', url, true);
  http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded; charset=iso-8859-1");
  http_request.setRequestHeader("Content-length", parameters.length);
  http_request.setRequestHeader("Connection", "close");
  http_request.send(parameters);
}