var Marquee = document.getElementById("NavOl"); //滚动对象
var Count=Marquee.innerHTML.toLowerCase().split("<li>").length;
var Height=27;
var wTop = Height * Count;
var Top=0;
var IsOver=false;
var IsRoll=null;
function MoveUp()
{
	window.clearTimeout(IsRoll);                    
	  Top=Top-1;	  
	  Marquee.style.top=Top+"px";
	  if (Top <= -wTop+Height ){
		Top = 0;
		Marquee.style.top=Top+"px";
	  }         
	if(-Top % Height != 0){	  
      IsRoll = window.setTimeout( "MoveUp()",30);
	}
}
function Run() {   
  if(!IsOver) MoveUp();    
  window.setTimeout( "Run()", 5000 );	       
}
Marquee.innerHTML+=Marquee.innerHTML;
window.setTimeout( "Run()", 5000 );