// JavaScript Document
        if (document.images) {
            img1on = new Image();      img1on.src = "images/nav_home_on.gif";
            img2on = new Image();      img2on.src = "images/nav_disclaimer_on.gif";
           img3on = new Image();      img3on.src = "images/nav_contact_on.gif";
		   img4on = new Image();      img4on.src = "images/nav_map_on.gif";


            img1off = new Image();     img1off.src = "images/nav_home_off.gif";
            img2off = new Image();     img2off.src = "images/nav_disclaimer_off.gif";
            img3off = new Image();     img3off.src = "images/nav_contact_off.gif";
			img4off = new Image();     img4off.src = "images/nav_map_off.gif";
              
        }


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


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