var myimages = new Array();
function preloadimages(){
for (i=0; i<preloadimages.arguments.length; i++){
myimages[i] = new Image();
myimages[i].src = preloadimages.arguments[i];
}
}
preloadimages(
"images/navigation_header/home_on.gif",
"images/navigation_header/routes_on.gif",
"images/navigation_header/book_on.gif",
"images/navigation_header/attend_on.gif",
"images/navigation_header/contact_on.gif");