//preload images
imgHome = new Image();
imgHome.src = "images/link-home.gif";
imgHomeOver = new Image();
imgHomeOver.src = "images/link-home-over.gif";
imgServices = new Image();
imgServices.src = "images/link-services.gif";
imgServicesOver = new Image();
imgServicesOver.src = "images/link-services-over.gif";
imgAboutUs = new Image();
imgAboutUs.src = "images/link-aboutus.gif";
imgAboutUsOver = new Image();
imgAboutUsOver.src = "images/link-aboutus-over.gif";
imgContact = new Image();
imgContact.src = "images/link-contact.gif";
imgContactOver = new Image();
imgContactOver.src = "images/link-contact-over.gif";
imgDT = new Image();
imgDT.src = "images/dt.gif";
imgDTOver = new Image();
imgDTOver.src = "images/dt-over.gif";

function linkOver(img, imgVar) {
	newImg = eval("img" + imgVar + ".src");
    img.src = newImg;
}