var hContact = new Image();
hContact.src = "images/contact_hover.gif";

var unhContact = new Image();
unhContact.src = "images/contact.gif";


function hoverContact(){
   document.getElementById("contact_button").src = hContact.src;
}

function unhoverContact(){
   document.getElementById("contact_button").src = unhContact.src;
}

function hoverRibbon(id){
   document.getElementById(id + "_tip").className = "hover_" + id + "_tip";
}

function unhoverRibbon(id){
   document.getElementById(id + "_tip").className = "item_" + id + "_tip";
}