function showMask()
{
	if(typeof isOldInternetExplorer !== 'undefined')
	{
		document.getElementById("mask").style.position = "absolute";
		document.getElementById("maskforeground").style.position = "absolute";
		window.onscroll = function()
		{
			var offset = 0;
			if(typeof(window.pageYOffset) == "number" )
				offset = window.pageYOffset;
			else if(document.body && (document.body.scrollLeft || document.body.scrollTop))
				offset = document.body.scrollTop;
			else if(document.documentElement && (document.documentElement.scrollLeft || document.documentElement.scrollTop))
				offset = document.documentElement.scrollTop;
			document.getElementById("mask").style.top = offset + "px";
			document.getElementById("maskforeground").style.top = offset + "px";
		}
		window.onresize = function()
		{
			var height = 0;
			if(typeof(window.innerWidth) == "number")
				height = window.innerHeight;
			else if(document.documentElement && (document.documentElement.clientWidth || document.documentElement.clientHeight))
				height = document.documentElement.clientHeight;
			else if(document.body && (document.body.clientWidth || document.body.clientHeight))
				height = document.body.clientHeight;
			document.getElementById("mask").style.height = height + "px";
			document.getElementById("maskforeground").style.height = height + "px";
		}
		window.onscroll();
		window.onresize();
	}
	document.getElementById("mask").style.display = "block";
	document.getElementById("maskforeground").style.display = "block";
}

function hideMask()
{
	if(typeof isOldInternetExplorer !== 'undefined')
	{
		window.onscroll = null;
		window.onresize = null;
	}
	document.getElementById("mask").style.display = "none";
	document.getElementById("maskforeground").style.display = "none";
}