// navigation start.

if (document.images)
{
// vars
b1_u = new Image;
b1_o = new Image;
b2_u = new Image;
b2_o = new Image;
b3_u = new Image;
b3_o = new Image;
b4_u = new Image;
b4_o = new Image;
// imgs
b1_u.src = "site_imgs/img_button_home_up.gif";
b1_o.src = "site_imgs/img_button_home_over.gif";
//
b2_u.src = "site_imgs/img_button_videos_up.gif";
b2_o.src = "site_imgs/img_button_videos_over.gif";
//
b3_u.src = "site_imgs/img_button_gallery_up.gif";
b3_o.src = "site_imgs/img_button_gallery_over.gif";
//
b4_u.src = "site_imgs/img_button_login_up.gif";
b4_o.src = "site_imgs/img_button_login_over.gif";
}
else
{
//
b1_u = "";
b1_o = "";
b2_u = "";
b2_o = "";
b3_u = "";
b3_o = "";
b4_u = "";
b4_o = "";
//
document.b1 = "";
document.b2 = "";
document.b3 = "";
document.b4 = "";
}

// navigation end.