$(document).ready(function(){
	$("#first_button").hover(
		function(){$(this).toggleClass("first_button_active");},
		function(){$(this).removeClass("first_button_active")}
	);
	$("#second_button").hover(
		function(){$(this).toggleClass("second_button_active");},
		function(){$(this).removeClass("second_button_active")}
	);
	$("#third_button").hover(
		function(){$(this).toggleClass("third_button_active");},
		function(){$(this).removeClass("third_button_active")}
	);
});