//var posY;


function openBG()
{
	a = document.getElementById('header').offsetHeight;
	b = document.getElementById('content').offsetHeight;
	c = document.getElementById('footer').offsetHeight;
	h = a+b+c+70; 												/* de content heeft een padding van 70px aan de onderkant*/
	document.getElementById('overlay').style.display = 'block';
	document.getElementById('overlay').style.height = h+'px';
}

function closeBG()
{
	document.getElementById('overlay').style.display = 'none';
}


function openLayer() {
    openBG();
    
// positie zetten!    
	if (window.innerHeight)
	{
		  pos = window.pageYOffset;
	}
	else if (document.documentElement && document.documentElement.scrollTop)
	{
		pos = document.documentElement.scrollTop;
	}
	else if (document.body)
	{
		  pos = document.body.scrollTop;
	}
	document.getElementById('pnlMasterPopup').style.top = pos+100+'px';
	
	document.getElementById('pnlMasterPopup').style.display = 'block';
	

    
}

function closeLayer() {
    if (isHelp)
    {
        // innerHTML leeggooien ivm doorspelen video
        var helpdiv = document.getElementById('DIV_helpvideo');
        if (helpdiv != null)
            helpdiv.innerHTML = '';
    }
    if (isJackVideo)
    {
        // innerHTML leeggooien ivm doorspelen video
        var JackOverMats = document.getElementById('JackOverMats');
        if (JackOverMats != null)
            JackOverMats.innerHTML = '';
    }
    closeBG();
    /* turn back on dropdowns*/
    el = document.getElementsByTagName('select');
    for(var i=0;i<el.length;i++){el[i].style.visibility = 'visible';}    
	document.getElementById('pnlMasterPopup').style.display = 'none';
}

function findPos(obj)
{   
	var curleft = curtop = 0;
	if (obj.offsetParent) {
		curleft = obj.offsetLeft
		curtop = obj.offsetTop
		while (obj = obj.offsetParent) {
			curleft += obj.offsetLeft
			curtop += obj.offsetTop
		}
	}
	
	return curtop;
}