onhome=new Image;
onhome.src= "images/on-home.gif";
onabout=new Image;
onabout.src= "images/on-aboutus.gif";
oncareers=new Image;
oncareers.src= "images/on-case.gif";
oncontact=new Image;
oncontact.src= "images/on-contact.gif";
function over(x,y){if(document.images) document.images[x].src="images/"+y+"-"+x+".gif";}