function floattop(){
	haut=getLayer("samplescart");
  wallrack=getLayer("listwall");
  if(document.documentElement.scrollTop==0 || window.pageYOffset==0){
      if(ie)haut.style.pixelTop=0;
      else haut.style.top=0;
    }
  if(haut.offsetHeight<=wallrack.offsetHeight &&(document.documentElement.scrollTop-haut.offsetHeight)>0){
    if(ie)	{haut.style.pixelTop=(document.documentElement.scrollTop-haut.offsetHeight);}
	  else	{haut.style.top = (window.pageYOffset-haut.offsetHeight) +"px";}

  }
}