$(document).ready(function() {
	$('input[type="image"]').mouseenter(
		function () { this.src = this.src.replace(/-off/, '-on');}
	);
	$('input[type="image"]').mousedown(
		function () { this.src = this.src.replace(/-on/, '-click'); }
	);
	$('input[type="image"]').mouseleave(
		function () { this.src = this.src.replace(/-on/, '-off'); }
	);
	$('input[type="image"]').mouseleave(
		function () { this.src = this.src.replace(/-click/, '-off'); }
	);
	$('input[type="image"]').mouseup(
		function () { this.src = this.src.replace(/-click/, '-on'); }
	);
});