mback10 = new Image();
  mback10.src = "./img/facebook0.gif";

  mback11 = new Image();
  mback11.src="./img/facebook1.gif";

  mback20 = new Image();
  mback20.src = "./img/rss0.gif";

  mback21 = new Image();
  mback21.src="./img/rss1.gif";

  mback30 = new Image();
  mback30.src = "./img/twitter0.gif";
  
  mback31 = new Image();
  mback31.src="./img/twitter1.gif";

  mback40 = new Image();
  mback40.src = "./img/youtube0.gif";

  mback41 = new Image();
  mback41.src="./img/youtube1.gif";
  
    

function MM_showHideLayers() { //v3.0
  var i,p,v,obj,args=MM_showHideLayers.arguments;
  if(document.getElementById){
   for (i=0; i<(args.length-2); i+=3){
   obj=document.getElementById(args[i]);v=args[i+2];
v=(v=='show')?'visible':(v='hide')?'hidden':v;
   if(obj)obj.style.visibility=v;
   }
  }
  else{
  for (i=0; i<(args.length-2); i+=3) if ((obj=MM_findObj(args[i]))!=null) { v=args[i+2];
    if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v='hide')?'hidden':v; }
    obj.visibility=v; }
 }
}