if (document.images) {
                  
            img1on = new Image(); 
            img1on.src = "images/nav.on.1.gif";   
            img2on = new Image();
            img2on.src = "images/nav.on.2.gif";
            img3on = new Image();
            img3on.src = "images/nav.on.3.gif";
            img4on = new Image();
            img4on.src = "images/nav.on.4.gif";
            img5on = new Image();
            img5on.src = "images/nav.on.5.gif";
            img6on = new Image();
            img6on.src = "images/nav.on.6.gif";
            img7on = new Image();
            img7on.src = "images/nav.on.7.gif";
            img8on = new Image();
            img8on.src = "images/nav.on.8.gif";
            img9on = new Image();
            img9on.src = "images/nav.on.9.gif";
			btn1on = new Image();
			btn1on.src = "images/btn_MtnHomes_on.gif";
			Foreson = new Image();
			Foreson.src = "images/btn_Fores_on.gif";
			Keyston = new Image();
			Keyston.src = "images/btn_Keyst_on.gif";
			Foreson = new Image();
			Foreson.src = "images/btn_Fores_on.gif";
			Mounton = new Image();
			Mounton.src = "images/btn_Mount_on.gif";
			Riveron = new Image();
			Riveron.src = "images/btn_River_on.gif";
            
            img1off = new Image(); 
            img1off.src = "images/nav.off.1.gif";   
            img2off = new Image();
            img2off.src = "images/nav.off.2.gif";
            img3off = new Image();
            img3off.src = "images/nav.off.3.gif";
            img4off = new Image();
            img4off.src = "images/nav.off.4.gif";
            img5off = new Image();
            img5off.src = "images/nav.off.5.gif";
            img6off = new Image();
            img6off.src = "images/nav.off.6.gif";
            img7off = new Image();
            img7off.src = "images/nav.off.7.gif";
            img8off = new Image();
            img8off.src = "images/nav.off.8.gif";
            img9off = new Image();
            img9off.src = "images/nav.off.9.gif";
			btn1off = new Image();
			btn1off.src = "images/btn_MtnHomes_off.gif";
			Foresoff = new Image();
			Foresoff.src = "images/btn_Fores_off.gif";
			Keystoff = new Image();
			Keystoff.src = "images/btn_Keyst_off.gif";
			Mountoff = new Image();
			Mountoff.src = "images/btn_Mount_off.gif";
			Riveroff = new Image();
			Riveroff.src = "images/btn_River_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");
        }
}