function rollOn (sel, def) {
   document[def].src = "images/btn" + def + "1.gif";
   document[sel].src = "images/btn" + sel + "2.gif";
}
function rollOff (sel, def) {
   document[sel].src = "images/btn" + sel + "1.gif";
   document[def].src = "images/btn" + def + "2.gif";
}

// Create Image Popups
function popImg(imgNme, imgTxt, imgW, imgH) {
   var pURL='imgview.html?imgNme=' + escape(imgNme) + '&imgTxt=' + escape(imgTxt);
   var pInfo='toolbar=0,';
       pInfo+='location=0,';
       pInfo+='directories=0,';
       pInfo+='status=0,';
       pInfo+='menubar=1,';
       pInfo+='scrollbars=0,';
       pInfo+='resizable=1,';
       pInfo+='width=' + (imgW+70) + ',';
       pInfo+='height=' + (imgH+70) + ',';
       pInfo+='top=0';

   if (screen) {
      if (screen.width < (imgW+70))
         pInfo+=',left=0';
      else
         pInfo+=',left=' + ((screen.width/2)-((imgW/2)+70));
   }
   window.open(pURL,'', pInfo);
}