if (document.images) {
    
    home_on=new Image();
    home_on.src="/img/home_on.gif";
    home_off=new Image();
    home_off.src="/img/home_off.gif";
    
    services_on=new Image();
    services_on.src="/img/services_on.gif";
    services_off=new Image();
    services_off.src="/img/services_off.gif";
    
    register_on=new Image();
    register_on.src="/img/register_on.gif";
    register_off=new Image();
    register_off.src="/img/register_off.gif";
    
    contact_on=new Image();
    contact_on.src="/img/contact_on.gif";
    contact_off=new Image();
    contact_off.src="/img/contact_off.gif";
    
    branding_on=new Image();
    branding_on.src="/img/branding_on.gif";
    branding_off=new Image();
    branding_off.src="/img/branding_off.gif";
    
    agencies_on=new Image();
    agencies_on.src="/img/agencies_on.gif";
    agencies_off=new Image();
    agencies_off.src="/img/agencies_off.gif";
    
    artists_on=new Image();
    artists_on.src="/img/artists_on.gif";
    artists_off=new Image();
    artists_off.src="/img/artists_off.gif";
    
    charities_on=new Image();
    charities_on.src="/img/charities_on.gif";
    charities_off=new Image();
    charities_off.src="/img/charities_off.gif";
   
}

function img_ovr(imgName) {
    if (document.images) {
        document[imgName].src = eval(imgName + "_on.src");
    }
}

function img_out(imgName) {
    if (document.images) {
        document[imgName].src = eval(imgName + "_off.src");
    }
}