//이미지롤오버
function rollover (obj_img){
	var re = new RegExp('.gif');
	obj_img.src = obj_img.src.replace(re,'_on.gif');
}

function rollout (obj_img){
	var re = new RegExp('_on.gif');
	obj_img.src = obj_img.src.replace(re,'.gif');
}