mn_career_up=new Image(73,10);
mn_career_up.src="images/mn_abt_career.gif";
mn_career_down=new Image(73,10);
mn_career_down.src="images/mn_abt_career_act.gif";

mn_contact2_up=new Image(73,10);
mn_contact2_up.src="images/mn_abt_contact.gif";
mn_contact2_down=new Image(73,10);
mn_contact2_down.src="images/mn_abt_contact_act.gif";