if (document.images) {
            img1on = new Image();
            img1on.src = "/picts/search_big.gif";
            img1off = new Image();
            img1off.src = "/picts/search_small.gif"; 

     img3on = new Image();
            img3on.src = "/picts/news_big.gif";
            img3off = new Image();
            img3off.src = "/picts/news_small.gif"; 


     img2on = new Image();
            img2on.src = "/picts/about_big.gif";
            img2off = new Image();
            img2off.src = "/picts/about_small.gif"; 


     img4on = new Image();
            img4on.src = "/picts/quiz_big.gif";
            img4off = new Image();
            img4off.src = "/picts/quiz_small.gif"; 


     img5on = new Image();
            img5on.src = "/picts/questions_big.gif";
            img5off = new Image();
            img5off.src = "/picts/questions_small.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");}
}