function setOpacity(obj, opac) {
  opac = (opac == 100)?99.999:opac;
  // IE/Win
  obj.style.filter = "alpha(opacity:"+opac+")";
  // Safari<1.2, Konqueror
  obj.style.KHTMLOpacity = opac/100;
  // Older Mozilla and Firefox
  obj.style.MozOpacity = opac/100;
  // Safari 1.2, newer Firefox and Mozilla, CSS3
  obj.style.opacity = opac/100;
}
var a=0;
function fade(){
if(document.all)
setOpacity(b, a)
a++
if(document.all)
setOpacity(c, a)
a++
setTimeout("fade()",5)
}