// preload images
preloadImages = function(){
  if (document.images){
    preload_image_object = new Image();
  
    btn = new Array();
    btn[0] = "/PrimaryTemplateFiles/images/btn_aboutus2.gif";
    btn[1] = "/PrimaryTemplateFiles/images/btn_ourteam2.gif";
    btn[2] = "/PrimaryTemplateFiles/images/btn_ourservices2.gif";
    btn[3] = "/PrimaryTemplateFiles/images/btn_resourcecentre2.gif";
    btn[4] = "/PrimaryTemplateFiles/images/btn_employment2.gif";

    var i = 0;
    for (i=0; i<=4; i++) {
    preload_image_object.src = btn[i];
    }
  }
}

// rollover images
swapImage = function(img_name, img_src){
  document[img_name].src = img_src;
}