var globalLayer;
		CheckDivHeight("divLitho");
	function switchLayer()
    {  
    var whichLayer;
    if(globalLayer==null)
        return;
    
    whichLayer=globalLayer
    globalLayer=null;

	document.getElementById("imgLitho").src = "../images/dt_lithoawaredesign_off.gif";
    document.getElementById("imgCMPawaredesign").src = "../images/dt_CMPawaredesign_off.gif";
    document.getElementById("imgPhysicalverification").src = "../images/dt_physicalverif_off.gif";
    document.getElementById("imgChipOptimization").src = "../images/dt_chipoptimization_off.gif";
    document.getElementById("imgSiliconDiagnostics").src = "../images/dt_silicondiagnostics_off.gif";
    document.getElementById("imgDesignforyield").src = "../images/dt_designforyield_off.gif";
    document.getElementById("imgMaskdatapreparation").src = "../images/dt_maskdataprep_off.gif";
    
	HideLayer("divLitho");
    HideLayer("divCMPawaredesign");
	HideLayer("divPhysicalverification");
    HideLayer("divChipOptimization");
    HideLayer("divSiliconDiagnostics");
    HideLayer("divDesignforyield");
    HideLayer("divMaskdatapreparation");  
	
	if(whichLayer.id == "imgLitho")
    {
		document.getElementById("imgLitho").src = "../images/dt_lithoawaredesign_on.gif";
		ShowLayer("divLitho");
    }
    if(whichLayer.id == "imgCMPawaredesign")
    {
		document.getElementById("imgCMPawaredesign").src = "../images/dt_CMPawaredesign_on.gif";
		ShowLayer("divCMPawaredesign");
    }

	if(whichLayer.id == "imgPhysicalverification")
    {
		document.getElementById("imgPhysicalverification").src = "../images/dt_physicalverif_on.gif";
		ShowLayer("divPhysicalverification");
    }
    if(whichLayer.id == "imgChipOptimization")
    {
		document.getElementById("imgChipOptimization").src = "../images/dt_chipoptimization_on.gif";
		ShowLayer("divChipOptimization");
    }
    if(whichLayer.id == "imgSiliconDiagnostics")
    {
		 document.getElementById("imgSiliconDiagnostics").src = "../images/dt_silicondiagnostics_on.gif";
		 ShowLayer("divSiliconDiagnostics");
    }
    if(whichLayer.id == "imgDesignforyield")
    {
		 document.getElementById("imgDesignforyield").src = "../images/dt_designforyield_on.gif";
		ShowLayer("divDesignforyield");
    }
    if(whichLayer.id == "imgMaskdatapreparation")
    {
		 document.getElementById("imgMaskdatapreparation").src = "../images/dt_maskdataprep_on.gif";
		ShowLayer("divMaskdatapreparation");
    }   
    

}

function switchLayerInit(whichLayer)
{        
  	globalLayer=whichLayer; 
    setTimeout('switchLayer();',500);
}

function switchLayerOut()
{
	globalLayer=null;

}

function HideLayer(divID)
{
	document.getElementById(divID).style.display = "none";
	document.getElementById(divID).style.visibility = "hidden";
}

function ShowLayer(divID)
{
	document.getElementById(divID).style.display = "block";
	document.getElementById(divID).style.visibility = "visible";
	CheckDivHeight(divID);
}
function CheckDivHeight(divID)
{
	if (document.getElementById(divID).offsetHeight < 500)
		{
			document.getElementById(divID).style.height= "500px"
		}
}

function findPosY(obj)
  {
    var curtop = 0;
    if(obj.offsetParent)
        while(1)
        {
          curtop += obj.offsetTop;
          if(!obj.offsetParent)
            break;
          obj = obj.offsetParent;
        }
    else if(obj.y)
        curtop += obj.y;
    return curtop;
  }