var globalLayer;
CheckDivHeight("divfrontendPCBdesign");
function switchLayer()
{  
	var whichLayer;
	if(globalLayer==null)
	return;
	
	whichLayer=globalLayer
	globalLayer=null;
	
	document.getElementById("imgfrontendPCBdesign").src = "../images/dt_frontendPCBdesign_off.gif";
	document.getElementById("imgFPGAPCBcodesign").src = "../images/dt_fpgapcbcodesign_off.gif";
	document.getElementById("imgAMSsimulation").src = "../images/dt_AMSsimulation_off.gif";
	document.getElementById("imglayoutrouting").src = "../images/dt_layoutrouting_off.gif";
	document.getElementById("imgsignalpowerinteg").src = "../images/dt_signalpowerinteg_off.gif";
	document.getElementById("imglibrarydatadesign").src = "../images/dt_librarydatadesign_off.gif";
    
	HideLayer("divfrontendPCBdesign");
	HideLayer("divFPGAPCBcodesign");
	HideLayer("divAMSsimulation");
	HideLayer("divlayoutrouting");
	HideLayer("divsignalpowerinteg");
	HideLayer("divlibrarydatadesign");
	
	if(whichLayer.id == "imgfrontendPCBdesign")
    {
		document.getElementById("imgfrontendPCBdesign").src = "../images/dt_frontendPCBdesign_on.gif";
		ShowLayer("divfrontendPCBdesign");
    }
    if(whichLayer.id == "imgFPGAPCBcodesign")
    {
		document.getElementById("imgFPGAPCBcodesign").src = "../images/dt_fpgapcbcodesign_on.gif";
		ShowLayer("divFPGAPCBcodesign");
    }
    if(whichLayer.id == "imgAMSsimulation")
    {
		document.getElementById("imgAMSsimulation").src = "../images/dt_AMSsimulation_on.gif";
		ShowLayer("divAMSsimulation");
    }
    if(whichLayer.id == "imglayoutrouting")
    {
		document.getElementById("imglayoutrouting").src = "../images/dt_layoutrouting_on.gif";
		ShowLayer("divlayoutrouting");
    }
    if(whichLayer.id == "imgsignalpowerinteg")
    {
		 document.getElementById("imgsignalpowerinteg").src = "../images/dt_signalpowerinteg_on.gif";
		ShowLayer("divsignalpowerinteg");
    }
    if(whichLayer.id == "imglibrarydatadesign")
    {
		document.getElementById("imglibrarydatadesign").src = "../images/dt_librarydatadesign_on.gif";
		ShowLayer("divlibrarydatadesign");
    }  
}

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= "auto"
		}
}

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;
}