browser = (((navigator.appName == "Netscape") &&

(parseInt(navigator.appVersion) >= 3 ))

        || ((navigator.appName == "Microsoft Internet Explorer") &&

        (parseInt(navigator.appVersion) >= 3 )))



        if (document.images) {



        	img1off = new Image();

            img1off.src = "images/button_pubcrawl.jpg";

        	img2off = new Image();

            img2off.src = "images/button_submit.jpg";

        	img3off = new Image();

            img3off.src = "images/button_twitter.jpg";
          


        	img1on = new Image();

            img1on.src = "images/button_pubcrawl_on.jpg";

            img2on = new Image();

            img2on.src = "images/button_submit_on.jpg";

            img3on = new Image();

            img3on.src = "images/button_twitter_on.jpg";


            }



function imgOff(imgName) {

        if (document.images) {

            document[imgName].src = eval(imgName + "off.src");

        }

}



function imgOn(imgName) {

        if (document.images) {

            document[imgName].src = eval(imgName + "on.src");

        }

}