if (document.images) {
  introOff = new Image()
  introOff.src = "images/nav_intro_off.gif"
  newsOff = new Image()
  newsOff.src = "images/nav_news_off.gif"
  projectsOff = new Image()
  projectsOff.src = "images/nav_projects_off.gif"
  peopleOff = new Image()
  peopleOff.src = "images/nav_people_off.gif"
  brochureOff = new Image()
  brochureOff.src = "images/nav_brochure_off.gif"
  contactOff = new Image()
  contactOff.src = "images/nav_contact_off.gif"
  
  introOver = new Image()
  introOver.src = "images/nav_intro_on.gif"
  newsOver = new Image()
  newsOver.src = "images/nav_news_on.gif"
  projectsOver = new Image()
  projectsOver.src = "images/nav_projects_on.gif"
  peopleOver = new Image()
  peopleOver.src = "images/nav_people_on.gif"
  brochureOver = new Image()
  brochureOver.src = "images/nav_brochure_on.gif"
  contactOver = new Image()
  contactOver.src = "images/nav_contact_on.gif"
  
  introOut = new Image()
  introOut.src = "images/nav_intro_on.gif"
  newsOut = new Image()
  newsOut.src = "images/nav_news_on.gif"
  projectsOut = new Image()
  projectsOut.src = "images/nav_projects_on.gif"
  peopleOut = new Image()
  peopleOut.src = "images/nav_people_on.gif"
  brochureOut = new Image()
  brochureOut.src = "images/nav_brochure_on.gif"
  contactOut = new Image()
  contactOut.src = "images/nav_contact_on.gif"
 
}
function changeImage(name,image) {
  if (document.images[name]) document.images[name].src = eval(image+'.src');
}
function menuOnHide(sender) {
  changeImage(sender.Trigger,sender.Trigger+"Off");
}
function menuOnMouseOver(sender) {
  changeImage(sender.Trigger,sender.Trigger+"Out");
}
function navOver(name,event) {
  changeImage(name,name+"Over");
  
}
function navOut(name,event) {

 changeImage(name,name+"Off");

}