if(document.images){

        // define main menu images
        imghome_off = new Image(67,35);
        imghome_off.src = "/Content/Images/Navigation/Black/home-off.jpg";
        imghome_on = new Image(67,35);
        imghome_on.src = "/Content/Images/Navigation/Black/home-on.jpg";	
    	
        imgbio_off = new Image(52,35);
        imgbio_off.src = "/Content/Images/Navigation/Black/bio-off.jpg";
        imgbio_on = new Image(52,35);
        imgbio_on.src = "/Content/Images/Navigation/Black/bio-on.jpg";

        imgagenda_off = new Image(103,35);
        imgagenda_off.src = "/Content/Images/Navigation/Black/agenda-off.jpg";
        imgagenda_on = new Image(103,35);
        imgagenda_on.src = "/Content/Images/Navigation/Black/agenda-on.jpg";
    	
        imgmedia_off = new Image(82,35);
        imgmedia_off.src = "/Content/Images/Navigation/Black/media-off.jpg";
        imgmedia_on = new Image(82,35);
        imgmedia_on.src = "/Content/Images/Navigation/Black/media-on.jpg";
    	
        imglinks_off = new Image(77,35);
        imglinks_off.src = "/Content/Images/Navigation/Black/links-off.jpg";
        imglinks_on = new Image(77,35);
        imglinks_on.src = "/Content/Images/Navigation/Black/links-on.jpg";

        imgcontact_off = new Image(136,35);
        imgcontact_off.src = "/Content/Images/Navigation/Black/contact-off.jpg";
        imgcontact_on = new Image(136,35);
        imgcontact_on.src = "/Content/Images/Navigation/Black/contact-on.jpg";
        }
        function imgon(imgName){
            if(document.images)document[imgName].src=eval("img"+imgName+"_on.src");
        }
        function imgoff(imgName){
            if(document.images)document[imgName].src=eval("img"+imgName+"_off.src");
        }