var listTerm = 5000;

 window.setTimeout("list_today()", listTerm); 

  function list_today()
  {
  	if(document.getElementById("mainTopBan1").style.display=="")
  	{
  		bannerOver('2');
  	}
  	else
  	{
  		bannerOver('1');
  	}
  	window.setTimeout("list_today()", listTerm);
  }
	function bannerOver(overNum)
	{
		if (overNum == 1)
		{
			document.getElementById("mainTopBan1").style.display = "";
			document.getElementById("mainTopBan2").style.display = "none";
			document.getElementById("mainTopBan3").style.display = "none";
			document.getElementById("mainTopBan4").style.display = "none";

			document.getElementById("btn01S").style.display = "";
			document.getElementById("btn01").style.display = "none";
			document.getElementById("btn02S").style.display = "none";
			document.getElementById("btn02").style.display = "";
			document.getElementById("btn03S").style.display = "none";
			document.getElementById("btn03").style.display = "";
			document.getElementById("btn04S").style.display = "none";
			document.getElementById("btn04").style.display = "";
		}
		if (overNum == 2)
		{
			document.getElementById("mainTopBan1").style.display = "none";
			document.getElementById("mainTopBan2").style.display = "";
			document.getElementById("mainTopBan3").style.display = "none";
			document.getElementById("mainTopBan4").style.display = "none";
	
			document.getElementById("btn01S").style.display = "none";
			document.getElementById("btn01").style.display = "";
			document.getElementById("btn02S").style.display = "";
			document.getElementById("btn02").style.display = "none";
			document.getElementById("btn03S").style.display = "none";
			document.getElementById("btn03").style.display = "";
			document.getElementById("btn04S").style.display = "none";
			document.getElementById("btn04").style.display = "";
		}
		if (overNum == 3)
		{
			document.getElementById("mainTopBan1").style.display = "none";
			document.getElementById("mainTopBan2").style.display = "none";
			document.getElementById("mainTopBan3").style.display = "";
			document.getElementById("mainTopBan4").style.display = "none";
	
			document.getElementById("btn01S").style.display = "none";
			document.getElementById("btn01").style.display = "";
			document.getElementById("btn02S").style.display = "none";
			document.getElementById("btn02").style.display = "";
			document.getElementById("btn03S").style.display = "";
			document.getElementById("btn03").style.display = "none";
			document.getElementById("btn04S").style.display = "none";
			document.getElementById("btn04").style.display = "";
		}
		if (overNum == 4)
		{
			document.getElementById("mainTopBan1").style.display = "none";
			document.getElementById("mainTopBan2").style.display = "none";
			document.getElementById("mainTopBan3").style.display = "none";
			document.getElementById("mainTopBan4").style.display = "";
	
			document.getElementById("btn01S").style.display = "none";
			document.getElementById("btn01").style.display = "";
			document.getElementById("btn02S").style.display = "none";
			document.getElementById("btn02").style.display = "";
			document.getElementById("btn03S").style.display = "none";
			document.getElementById("btn03").style.display = "";
			document.getElementById("btn04S").style.display = "";
			document.getElementById("btn04").style.display = "none";
		}
	}