if (document.images)
   {
  	 mission_off = new Image
	 mission_on = new Image
	 news_off = new Image
	 news_on = new Image
	 officers_off = new Image
	 officers_on = new Image	 
 	 members_off = new Image
	 members_on = new Image
	 contact_off = new Image
	 contact_on = new Image	 
	 mission_off.src = "images/navbar_mission.jpg"
	 mission_on.src = "images/navbar_mission_a.jpg"
	 news_off.src = "images/navbar_news.jpg"
	 news_on.src = "images/navbar_news_a.jpg"
	 officers_off.src = "images/navbar_officers.jpg"
	 officers_on.src = "images/navbar_officers_a.jpg"
	 members_off.src = "images/navbar_members.jpg"
	 members_on.src = "images/navbar_members_a.jpg"
	 contact_off.src = "images/navbar_contact.jpg"
	 contact_on.src = "images/navbar_contact_a.jpg"
	 
	 }
	 
  function chgImg(imgField,newImg) 
  	{if (document.images) {document[imgField].src=eval (newImg + ".src")}}