abon = new Image;
abon.src = "../images/nav_about_on.gif";
aboff = new Image;
aboff.src = "../images/nav_about.gif";

svon = new Image;
svon.src = "../images/nav_services_on.gif";
svoff = new Image;
svoff.src = "../images/nav_services.gif";

cnon = new Image;
cnon.src = "../images/nav_contact_on.gif";
cnoff = new Image;
cnoff.src = "../images/nav_contact.gif";

pron = new Image;
pron.src = "../images/nav_news_on.gif";
proff = new Image;
proff.src = "../images/nav_news.gif";

iron = new Image;
iron.src = "../images/nav_ir_on.gif";
iroff = new Image;
iroff.src = "../images/nav_ir.gif";

function over(imgName) {
	document[imgName].src = eval(imgName + "on.src");
}
function out(imgName) {
	document[imgName].src = eval(imgName + "off.src");
}