if (document.images) {
home_a = new Image(162,40);home_a.src = 'img/btn_t_home.gif';
home_b = new Image(162,40);home_b.src = 'img/btn_t_home_ov.gif';
up_a = new Image(162,40);up_a.src = 'img/btn_t_up.gif';
up_b = new Image(162,40);up_b.src = 'img/btn_t_up_ov.gif';
message_a = new Image(162,40);message_a.src = 'img/btn_t_message.gif';
message_b = new Image(162,40);message_b.src = 'img/btn_t_message_ov.gif';
books_a = new Image(162,40);books_a.src = 'img/btn_t_books.gif';
books_b = new Image(162,40);books_b.src = 'img/btn_t_books_ov.gif';
column_a = new Image(162,52);column_a.src = 'img/btn_t_column.gif';
column_b = new Image(162,52);column_b.src = 'img/btn_t_column_ov.gif';
media_a = new Image(162,37);media_a.src = 'img/btn_t_media.gif';
media_b = new Image(162,37);media_b.src = 'img/btn_t_media_ov.gif';
link_a = new Image(162,39);link_a.src = 'img/btn_t_link.gif';
link_b = new Image(162,39);link_b.src = 'img/btn_t_link_ov.gif';
contact_a = new Image(162,56);contact_a.src = 'img/btn_t_contact.gif';
contact_b = new Image(162,56);contact_b.src = 'img/btn_t_contact_ov.gif';

}
function di(id,name){
  if (document.images) {document.images[id].src=eval(name+".src"); }
}