if (document.images) {


            Rimg1on = new Image();

            Rimg1on.src = "images/hom_nav_01b.gif";


            Rimg2on = new Image();

            Rimg2on.src = "images/hom_nav_02b.gif";


            Rimg3on = new Image();

            Rimg3on.src = "images/hom_nav_03b.gif";


            Rimg4on = new Image();

            Rimg4on.src = "images/hom_nav_04b.gif";




            Bimg20on = new Image();

            Bimg20on.src = "images/res_button_b.gif";


            Bimg21on = new Image();

            Bimg21on.src = "images/vid_button_b.gif";




            Rimg1off = new Image();

            Rimg1off.src = "images/hom_nav_01a.gif";


            Rimg2off = new Image();

            Rimg2off.src = "images/hom_nav_02a.gif";


            Rimg3off = new Image();

            Rimg3off.src = "images/hom_nav_03a.gif";


            Rimg4off = new Image();

            Rimg4off.src = "images/hom_nav_04a.gif";




            Bimg20off = new Image();

            Bimg20off.src = "images/res_button_a.gif";


            Bimg21off = new Image();

            Bimg21off.src = "images/vid_button_a.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");

        }

}