function killFullscreen()
{
  if ((YAHOO.util.Dom.hasClass(document.body, "slideshow")) && myform)
    myform.parentNode.removeChild(myform);
}
function updateSS() {
     // look at the body tags classes, if it is the homepage then swap
     bodyClass = document.getElementsByTagName("body")[0].className;
     if (bodyClass.indexOf("slideshow") != -1) {
          slideDuration = 4;
          document.getElementById("duration").value = "4";
     }
}
<span class="style1">Red</span>-<span class="style2">Blue</span>-<span class="style3">Green</span>-<span class="style2">Blue</span>