function centering(){

	var windowWidth = $(window).width();
	var windowHeight = $(window).height();
	var elementWidth = $("#content").width();
	var elementHeight = $("#content").height();

	if((windowWidth - elementWidth) > 0){
		var marginLeft = (windowWidth - elementWidth)/2;
		$("#content").css("margin-left",marginLeft);
	}else{
		$("#content").css("margin-left",0);
	}

	if((windowHeight - elementHeight) > 0){
		var marginTop = (windowHeight - elementHeight)/2;
		$("#content").css("margin-top",marginTop);
	}else{
		$("#content").css("margin-top",0);
	}

}

$(function(){
	centering();
});

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