//pictures preloading
var change = new Array();
var dir="images/";
change[0] = new Image();change[0].src = dir+"home_off.gif";
change[1] = new Image();change[1].src = dir+"home_on.gif";
change[2] = new Image();change[2].src = dir+"about_off.gif";
change[3] = new Image();change[3].src = dir+"about_on.gif";
change[4] = new Image();change[4].src = dir+"events_off.gif";
change[5] = new Image();change[5].src = dir+"events_on.gif";
change[6] = new Image();change[6].src = dir+"contact_off.gif";
change[7] = new Image();change[7].src = dir+"contact_on.gif";

//function for rollover (with layer or not)
function roll(lelayer,nouvelle,image) {
if (ns && browserVer <6 && lelayer !== null){
document.layers[lelayer].document[image].src = change[nouvelle].src
}else if (ie || lelayer== null)
document[image].src = change[nouvelle].src;
}