$(function () {
	resizing();
	
	$(elemId).show();

	var resizeTimer = null;
	$(window).bind('resize', function() {
		if (resizeTimer) clearTimeout(resizeTimer);
		resizeTimer = setTimeout(resizing, 100);
	});
});

function resizing() {
	var h = $(window).height();
	var w = $(window).width();
	var win = w/h;
	if (img > win) {
		$(elemId).css('height', '100%').css('width', 'auto');
	} else {
		$(elemId).css('height', 'auto%').css('width', '100%');
	}
	$(elemId).show();
}