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$(document).ready(function(){
	$(window).resize(function(){
		var target = '#main';
		$(target).css({
			position:'absolute',
			left: ($(window).width() - $(target).outerWidth())/2,
			top: ($(window).height() - $(target).outerHeight())/2
		});
	});

	// To initially run the function:
	$(window).resize();
});