$(document).ready(
	function()
	{
		resizeBackground();
	}
)

$(window).resize(
		function()
		{
			resizeBackground();
			
		}
);

function resizeBackground()
{
		$("#bgbot").css("height", "1px");
		var iHeightBB = $(document).height() - $("#bgbot").offset().top;
	
		$("#bgbot").css("height", iHeightBB);
}