function GetScreenDimensions()
    {
		//If we've not already done so, get the screen dimensions, we can fetch these on postback when use 
		//logs in
		if (document.Form1.hdScreenWidth.value != screen.width)
		{
			document.Form1.hdScreenWidth.value = screen.width;
			document.Form1.hdScreenHeight.value = screen.height;
			
		}
    }