if (document.images){
//five image objects for the active images
var img1on = new Image();
img1on.src = "../images/button_home_w.gif";
var img2on = new Image();
img2on.src = "../images/button_partners_w.gif";
var img3on = new Image();
img3on.src = "../images/button_services_w.gif";
var img4on = new Image();
img4on.src = "../images/button_repertoire_w.gif";
var img5on = new Image();
img5on.src = "../images/button_schedule_w.gif";
var img6on = new Image();
img6on.src = "../images/button_contact_w.gif";

//five image objects for the inactive images
var img1off = new Image();
img1off.src = "../images/button_home.gif";
var img2off = new Image();
img2off.src = "../images/button_partners.gif";
var img3off = new Image();
img3off.src = "../images/button_services.gif";
var img4off = new Image();
img4off.src = "../images/button_repertoire.gif";
var img5off = new Image();
img5off.src = "../images/button_schedule.gif";
var img6off = new Image();
img6off.src = "../images/button_contact.gif";
}

//function to active an image
function imgOn(imgName){
if (document.images){
    document.images[imgName].src = eval(imgName + "on.src");
}
}

//function to deactivate an image
function imgOff(imgName){
if (document.images){
    document.images[imgName].src = eval(imgName + "off.src");
}
}