function initImageSwap(selector, suffix){
	if(!suffix)
		suffix = '_over';
	
	$j(selector).hover(
		function(){
			var ext = this.src.substr(this.src.lastIndexOf('.'), this.src.length);
			this.src = this.src.replace(ext, suffix + ext);
		},
		function() {
			this.src = this.src.replace(suffix, '');
		});
}