bName = navigator.appName;
    bVer = parseInt(navigator.appVersion);
    ver = "other";

if ((bName == "Netscape" && !(bVer < 3))
 || (bName == "Microsoft Internet Explorer" && !(bVer < 4))) ver = "good";

if (ver == "good") {
        trnav1on = new Image();
        trnav1on.src = "buttons/home_on.gif";
        trnav1off = new Image();
        trnav1off.src = "buttons/home_off.gif";

        trnav2on = new Image();
        trnav2on.src = "buttons/ohan_on.gif";
        trnav2off = new Image();
        trnav2off.src = "buttons/ohan_off.gif";

        trnav3on = new Image();
        trnav3on.src = "buttons/athl_on.gif";
        trnav3off = new Image();
        trnav3off.src = "buttons/athl_off.gif";

        trnav4on = new Image();
        trnav4on.src = "buttons/spor_on.gif";
        trnav4off = new Image();
        trnav4off.src = "buttons/spor_off.gif";

        trnav5on = new Image();
        trnav5on.src = "buttons/spon_on.gif";
        trnav5off = new Image();
        trnav5off.src = "buttons/spon_off.gif";

 	    trnav6on = new Image();
        trnav6on.src = "buttons/volu_on.gif";
        trnav6off = new Image();
        trnav6off.src = "buttons/volu_off.gif";

    	trnav7on = new Image();
        trnav7on.src = "buttons/dona_on.gif";
        trnav7off = new Image();
        trnav7off.src = "buttons/dona_off.gif";

    	trnav8on = new Image();
        trnav8on.src = "buttons/cale_on.gif";
        trnav8off = new Image();
        trnav8off.src = "buttons/cale_off.gif";

        trnav9on = new Image();
        trnav9on.src = "buttons/give-away_on.gif";
        trnav9off = new Image();
        trnav9off.src = "buttons/give-away_off.gif";

        trnav10on = new Image();
        trnav10on.src = "buttons/jing_on.gif";
        trnav10off = new Image();
        trnav10off.src = "buttons/jing_off.gif";

        trnav11on = new Image();
        trnav11on.src = "buttons/gues_on.gif";
        trnav11off = new Image();
        trnav11off.src = "buttons/gues_off.gif";

    	 trnav12on = new Image();
        trnav12on.src = "buttons/gall_on.gif";
        trnav12off = new Image();
        trnav12off.src = "buttons/gall_off.gif";

        trnav13on = new Image();
        trnav13on.src = "buttons/form_on.gif";
        trnav13off = new Image();
        trnav13off.src = "buttons/form_off.gif";

        trnav14on = new Image();
        trnav14on.src = "buttons/cont_on.gif";
        trnav14off = new Image();
        trnav14off.src = "buttons/cont_off.gif";

}

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

function rolloff(imgName) {
    if (ver == "good") {
        document[imgName].src = eval(imgName + "off.src");
    }
}