// JAVASCRIPT FILE FOR TOP NAVIGATION ROLLOVERS
// USED BY ALL NON POP-UP WINDOWS, NOT USEDBY THE INDEX-HOME PAGE

var name = null;

if (document.images) {
off = new MakeArray(6)
on = new MakeArray(6)
what = new MakeArray(6)

off[1].src = "../images/ru_nav2_off.gif"
off[2].src = "../images/ru_nav3_off.gif"
off[3].src = "../images/ru_nav4_off.gif"	 
off[4].src = "../images/ru_nav5_off.gif"
off[5].src = "../images/ru_nav6_off.gif"
off[6].src = "../images/ru_nav7_off.gif"


on[1].src = "../images/ru_nav2_on.gif"
on[2].src = "../images/ru_nav3_on.gif"
on[3].src = "../images/ru_nav4_on.gif"	
on[4].src = "../images/ru_nav5_on.gif"
on[5].src = "../images/ru_nav6_on.gif"
on[6].src = "../images/ru_nav7_on.gif"


what[1] = "The Physical World home"
what[2] = "Site map"
what[3] = "Search"
what[4] = "Credits"
what[5] = "Contacts"
what[6] = "OU 207 course"
what[7] = "The Restless Universe"
}

function MakeArray(n) {
  this.length = n
  for (var i = 1; i<=n; i++) {
    this[i] = new Image()
    }
  return this
  }

function imageChange(number) {
  if (document.images)
  {                       
  document.images[number].src = on[number-1].src
  window.status = what[number-1]
  }
}

function resetChange(number) {
  if (document.images)
  {
  document.images[number].src = off[number-1].src
  window.status = what[7]
  }                   
}