$(function() {
	$(".button")
		.bind("mouseover", function() {
			this.src = this.src.replace(new RegExp(/(but_[a-z]+)/), "$1_over");
			this.style.cursor = "pointer";
			return false;	
		})
		.bind("mouseout", function() {
			this.src = this.src.replace(new RegExp(/(but_[a-z]+)_over/), "$1");
			return false;
		});
});