var btn_about_normal=new Image();	btn_about_normal.src='images/vn/btn_about_n.gif';
var btn_about_over=new Image();	btn_about_over.src='images/vn/btn_about_o.gif';
var btn_category_normal=new Image();	btn_category_normal.src='images/vn/btn_category_n.gif';
var btn_category_over=new Image();	btn_category_over.src='images/vn/btn_category_o.gif';
var btn_news_normal=new Image();	btn_news_normal.src='images/vn/btn_news_n.gif';
var btn_news_over=new Image();	btn_news_over.src='images/vn/btn_news_o.gif';
var btn_manager_normal=new Image();	btn_manager_normal.src='images/vn/btn_manager_n.gif';
var btn_manager_over=new Image();	btn_manager_over.src='images/vn/btn_manager_o.gif';
var btn_service_normal=new Image();	btn_service_normal.src='images/vn/btn_service_n.gif';
var btn_service_over=new Image();	btn_service_over.src='images/vn/btn_service_o.gif';
var btn_member_normal=new Image();	btn_member_normal.src='images/vn/btn_member_n.gif';
var btn_member_over=new Image();	btn_member_over.src='images/vn/btn_member_o.gif';

function ChangeImage(id, img) {
	id.src=img.src;
}