$(document).ready( function () {

	$("#leftside a img").hover(function() {
		var afname = this.src;
		var fname = afname.slice(afname.lastIndexOf('/')+1);
		var imgname = fname.slice(0,fname.indexOf('.'));
		this.src = '/img/' + imgname + '_o.gif';
	}, 
	function() {
		var afname = this.src;
		var fname = afname.slice(afname.lastIndexOf('/')+1);
		var imgname = fname.slice(0,fname.indexOf('_o'));
		this.src = '/img/' + imgname + '.gif';
	});

});