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

var onWindowResize = function() {
	
	$('#footerDiv').removeClass('fixed');
	var footerOffset = $('#footerDiv').offset();
	
	if(footerOffset.top < $(window).scrollTop() + $(window).height() - $('#footerDiv').height())
	{
		$('#footerDiv').addClass('fixed');
	}
	
}