function preloadImages() {
    if (document.images) {
      preload_image_object = new Image();
      image_url = new Array();
      image_url.push("/images/home/gyn_en_over.png");
	  image_url.push("/images/home/cos_en_over.png");
	  image_url.push("/images/home/midBarL.png");
	  image_url.push("/images/home/midBarR.png");
       for(var i=0; i<=image_url.length; i++) 
         preload_image_object.src = image_url[i];
    }
}

function swapImage(name) {
if(name=='gynecology') {
document.gynecology.src = "/images/home/gyn_en_over.png";
document.midBar.src = "/images/home/midBarL.png";
} else if(name=='cosmetics') {
document.cosmetics.src = "/images/home/cos_en_over.png";
document.midBar.src = "/images/home/midBarR.png";
}
}
function restore(name) {
if(name=='gynecology') {
document.gynecology.src = "/images/home/gyn_en_up.png";
document.midBar.src = "/images/home/midBar.png";
} else if(name=='cosmetics') {
document.cosmetics.src = "/images/home/cos_en_up.png";
document.midBar.src = "images/home/midBar.png";
}
}