function posLayers ()
{
	var posScrollBar = document.all ? document.documentElement.scrollTop : pageYOffset;	
	var leftPos = document.getElementById('content').offsetLeft + document.getElementById('content').offsetWidth + 107;
	if(document.all)
	{
		var htmlPos  = document.getElementsByTagName("html")[0].scrollHeight; /* MSIE */
		var limitPos = -140;
	}
	else
	{
		var htmlPos = document.getElementById('container').offsetHeight; /* Others */
		var limitPos = 45;
	}
	
	var marginTop = 350;
	pos = posScrollBar + marginTop + 'px';
	
	//document.getElementById('tab').innerHTML = leftPos;
	if(parseInt(pos) < (parseInt(htmlPos)-marginTop+limitPos))
	{
		document.getElementById('tab').style.top = pos;
		document.getElementById('tab').style.left = leftPos;
	}
}
setInterval(posLayers, 15);