function RfInit(){
   // The code below only works in IE 
   // window.RfLogoTop.background="images/LogoSmll.gif";
   // window.RpsfLogoTop.background="images/RpsfLogoZyx.jpg";
   // window.RpsfIntroduce.background="images/RpsfBigZyx.jpg";

   // The code below works in IE and other browsers
   //document.getElementById('RfLogoTop').style.backgroundImage = 'url(images/LogoSmll.gif)';
   //document.getElementById('RpsfLogoTop').style.backgroundImage = 'url(images/RpsfLogoZyx.jpg)';
   //document.getElementById('RpsfIntroduce').style.backgroundImage = 'url(images/RpsfBigZyx.jpg)';

   document.getElementById("RfLogoTop").style.backgroundImage = "url('images/LogoSmll.gif')";
   document.getElementById("RpsfLogoTop").style.backgroundImage = "url('images/RpsfLogoZyx.jpg')";
   document.getElementById("RpsfIntroduce").style.backgroundImage = "url('images/RpsfBigZyx.jpg')";
}