if (document.images) {				
                  cat10on = new Image(89,42);
                  cat10on.src="../images/cat10on.gif"; /*books*/
                  cat11on = new Image(118,42);
                  cat11on.src="../images/cat11on.gif"; /*tapes-CDs*/
                  cat12on = new Image(88,42);
                  cat12on.src="../images/cat12on.gif"; /*videos*/
                  cat13on = new Image(96,42);
                  cat13on.src="../images/cat13on.gif"; /*t-shirts*/
                  cat14on = new Image(98,42);
                  cat14on.src="../images/cat14on.gif"; /*toys*/

                  cat10off = new Image(89,42);
                  cat10off.src="../images/cat10off.gif";
                  cat11off = new Image(118,42);
                  cat11off.src="../images/cat11off.gif"
                  cat12off = new Image(88,42);
                  cat12off.src="../images/cat12off.gif";
                  cat13off = new Image(96,42);
                  cat13off.src="../images/cat13off.gif";
                  cat14off = new Image(98,42);
                  cat14off.src="../images/cat14off.gif";
                  }

function img_act(imgName) {
    if (document.images) {
    document[imgName].src = eval(imgName + "on.src");
    }
}

function img_inact(imgName) {
    if (document.images) {
    document[imgName].src = eval(imgName + "off.src");
    }
}