if (document.images) {

	var back21On = new Image();
      back21On.src = "../icons/back_on.gif";
      var back21Off = new Image();
      back21Off.src = "../icons/back_off.gif";

}

function changeIn(imageName) {
      if (!document.images) return;
      document.images[imageName].src = eval(imageName + "On.src");
}

function changeOut(imageName) {
      if (!document.images) return;
      document.images[imageName].src = eval(imageName + "Off.src");
}


document.write('<a onmouseover="changeIn(\'back21\');" onmouseout="changeOut(\'back21\');" href="javascript:history.go(-1)"><img src="../icons/back_off.gif" name="back21" border=0 width="96" height="28" vspace="1"></a>')