if (document.images) {

            Limg1on = new Image();

            Limg1on.src = "images/nvlt_01b.gif";


            Limg2on = new Image();

            Limg2on.src = "images/nvlt_02b.gif";


            Limg3on = new Image();

            Limg3on.src = "images/nvlt_03b.gif";


            Limg4on = new Image();

            Limg4on.src = "images/nvlt_04b.gif";


            Limg5on = new Image();

            Limg5on.src = "images/nvlt_05b.gif";


            Limg6on = new Image();

            Limg6on.src = "images/nvlt_06b.gif";


            Limg7on = new Image();

            Limg7on.src = "images/nvlt_07b.gif";


            Timg1on = new Image();

            Timg1on.src = "images/nvtp_01b.gif";


            Timg2on = new Image();

            Timg2on.src = "images/nvtp_02b.gif";


            Timg3on = new Image();

            Timg3on.src = "images/nvtp_03b.gif";


            Timg4on = new Image();

            Timg4on.src = "images/nvtp_04b.gif";






            Limg1off = new Image();

            Limg1off.src = "images/nvlt_01a.gif";


            Limg2off = new Image();

            Limg2off.src = "images/nvlt_02a.gif";


            Limg3off = new Image();

            Limg3off.src = "images/nvlt_03a.gif";


            Limg4off = new Image();

            Limg4off.src = "images/nvlt_04a.gif";


            Limg5off = new Image();

            Limg5off.src = "images/nvlt_05a.gif";


            Limg6off = new Image();

            Limg6off.src = "images/nvlt_06a.gif";


            Limg7off = new Image();

            Limg7off.src = "images/nvlt_07a.gif";


            Timg1off = new Image();

            Timg1off.src = "images/nvtp_01a.gif";


            Timg2off = new Image();

            Timg2off.src = "images/nvtp_02a.gif";


            Timg3off = new Image();

            Timg3off.src = "images/nvtp_03a.gif";


            Timg4off = new Image();

            Timg4off.src = "images/nvtp_04a.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");

        }

}