//显示层
function ShowLayer(nNum)
	{
		if (nNum==1)
		{
			document.all['div_Top_Menu1'].style.display = ""; 
		}
		if (nNum==2)
		{
			document.all['div_Top_Menu2'].style.display = ""; 
		}
		if (nNum==3)
		{
			document.all['div_Top_Menu3'].style.display = ""; 
		}
		if (nNum==4)
		{
			document.all['div_Top_Menu4'].style.display = ""; 
		}
		if (nNum==5)
		{
			document.all['div_Top_Menu5'].style.display = ""; 
		}
	}

//隐藏层
function HideLayer(nNum)
	{
	
		if (nNum==1)
		{	
			document.all['div_Top_Menu1'].style.display = "none"; 
		}
		if (nNum==2)
		{
			document.all['div_Top_Menu2'].style.display = "none"; 
		}
		if (nNum==3)
		{
			document.all['div_Top_Menu3'].style.display = "none"; 
		}
		if (nNum==4)
		{
			document.all['div_Top_Menu4'].style.display = "none"; 
		}
		if (nNum==5)
		{
			document.all['div_Top_Menu5'].style.display = "none"; 
		}
		
	}
//继显示层
	function ShowLayerDiv(nNum)
	{
		if (nNum==1)
		{
			document.all['div_Top_Menu1'].style.display = ""; 
		}
		if (nNum==2)
		{
			document.all['div_Top_Menu2'].style.display = ""; 
		}
		if (nNum==3)
		{
			document.all['div_Top_Menu3'].style.display = ""; 
		}
		if (nNum==4)
		{
			document.all['div_Top_Menu4'].style.display = ""; 
		}
		if (nNum==5)
		{
			document.all['div_Top_Menu5'].style.display = ""; 
		}

		
	}