function getWindowHeight()
{
	var windowHeight = 0;

	if (typeof(window.innerHeight) == "number")
	{
		windowHeight = window.innerHeight;
	}
	else
	{
		if (document.documentElement && document.documentElement.clientHeight)
		{
			windowHeight = document.documentElement.clientHeight;
		}
		else
		{
			if (document.body && document.body.clientHeight)
			{
				windowHeight = document.body.clientHeight;
			}
		}
	}

	return windowHeight;
}