if (document.images)
{
about_on = new Image();
about_on.src = "images/nav_about_on.jpg";
about_off = new Image();
about_off.src = "images/nav_about_off.jpg";

management_on = new Image();
management_on.src = "images/nav_management_on.jpg";
management_off = new Image();
management_off.src = "images/nav_management_off.jpg";

social_on = new Image();
social_on.src = "images/nav_social_on.jpg";
social_off = new Image();
social_off.src = "images/nav_social_off.jpg";

news_on = new Image();
news_on.src = "images/nav_news_on.jpg";
news_off = new Image();
news_off.src = "images/nav_news_off.jpg";

resources_on = new Image();
resources_on.src = "images/nav_resources_on.jpg";
resources_off = new Image();
resources_off.src = "images/nav_resources_off.jpg";

contact_on = new Image();
contact_on.src = "images/nav_contact_on.jpg";
contact_off = new Image();
contact_off.src = "images/nav_contact_off.jpg";

}

 function rollOn(imgName)
 {
   if (document.images) {
    imgOn = eval(imgName + "_on.src");
    document [imgName].src = imgOn;
   }
 }

 function rollOff(imgName)
 {
   if (document.images) {
    imgOff = eval(imgName + "_off.src");
    document [imgName].src = imgOff;
   }
 }
 
 function goto_URL(object) {
    window.location.href = object.options[object.selectedIndex].value;
}