function initmenu() {
		var images_path = "/img/";
		var items = document.getElementsByTagName('img');
		for(var i in items) {
			var item = items[i];
			if (item.id && item.id != "" && item.id.substr(0,4)=='off_') {
        Event.observe( item.id, 'mouseover',
                    function() {
                    	var src = images_path + "images/on_" + this.id.substr(4) + ".gif";
                    	this.src = src;
                    });
        Event.observe( item.id, 'mouseout',
                    function() {
                    	var src = images_path + "images/off_" + this.id.substr(4) + ".gif";
                    	this.src = src;
                    });
			} else {
			}
		}
}

Event.observe(window, 'load', function() {
		initmenu();
});