#midlink {width:700px; height:37px; text-align:center; background: url('images/nav_bg.jpg');}
#main_menu {padding:0; margin:0 0px; list-style-type:none; width:700px; height:36px; }
#main_menu li {float:left; display:inline; width:140px; background:url('images/nav_bg.jpg');}
#main_menu li a, #main_menu li a:visited {display:block; width:140px; height:37px; color:#ddd; font-size:14px; font-weight: bold; text-decoration:none; line-height:37px; font-family:arial, verdana, sans-serif; background:url('images/nav_bg.jpg');}

#main_menu li a:hover {color:#fff;  background:url('images/nav_over.jpg');} 
#main_menu li a.chosen, #main_menu li a.chosen:visited,  #main_menu li a:active, #main_menu li a:focus {color:#fff;  background:url('images/nav_chosen.jpg');}