var myimages=new Array()
var gotolink="#"

function preloadimages(){
for (i=0;i<preloadimages.arguments.length;i++){
myimages[i]=new Image()
myimages[i].src=preloadimages.arguments[i]
}
}

preloadimages("images/announcement.gif","images/announcement_on.jpg","images/welcome.gif","images/welcome_on.jpg","images/invitation.gif","images/invitation_on.jpg","images/timetable.gif","images/timetable_on.jpg","images/registration.gif","images/registration_on.jpg","images/hotel.gif","images/hotel_on.jpg","images/business.gif","images/business_on.jpg","images/about.gif","images/about_on.jpg")

function filter(imagename,objectsrc) {
if(document.images)
document.images[imagename].src=eval(objectsrc+".src")
}