if (document.images) {
  var home_off = new Image();
  home_off.src = "img/button_home.gif";
  var home_on = new Image();
  home_on.src = "img/button_homeOver.gif";

  var contact_off = new Image();
  contact_off.src = "img/button_contact.gif";
  var contact_on = new Image();
  contact_on.src = "img/button_contactOver.gif";

  var sitemap_off = new Image();
  sitemap_off.src = "img/button_sitemap.gif";
  var sitemap_on = new Image();
  sitemap_on.src = "img/button_sitemapOver.gif";
}

function activate(imgName) {
  if (document.images) {
    if ( eval(imgName + "_on.complete") ) {
      document.images[imgName].src = eval(imgName + "_on.src");
    }
  }
}

function deactivate(imgName) {
  if (document.images) {
    if ( eval(imgName + "_off.complete") ) {
      document.images[imgName].src = eval(imgName + "_off.src");
    }
  }
}


function popupWin() {
	popupwindow=window.open('prot/index.php','popupwindow','toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,width=650,height=600,left=20,top=20');
	popupwindow.focus();
}