$(function(){
	var contents = $("#contents");
	var sidenav = $("#sidenav");
	var initH = sidenav[0].offsetHeight;

	var isChanged = function() {
		
		var contentsH = contents[0].offsetHeight;
		var sidenavH = sidenav[0].offsetHeight;
		if(contentsH > sidenavH) {
			sidenav.height(contentsH-15);
		}
		else {
			if(initH > contentsH) {
				sidenav.height(initH);
			}
			else {
				sidenav.height(contentsH-15);
			}
		}
	};

	isChanged();
	setInterval(isChanged, 1000);
	
});