function initPopup()
{
	var button = document.getElementById("button-open");
	var popup = document.getElementById("popup");
	if(button && popup)
	{
		var links = popup.getElementsByTagName("a");
		if(links)
		{
			for (var i=0; i<links.length; i++)
			{
				links[i].onclick = function ()
				{
					popup.style.display = "none";
				}
			}
		}
		button.onclick = function ()
		{
			if(popup.style.display == "block")
				popup.style.display = "none";
			else
				popup.style.display = "block";
		}
	}
}

if (window.addEventListener)
{
	window.addEventListener("load", initPopup, false);
}
else if (window.attachEvent)
{
	window.attachEvent("onload", initPopup);
}