function SwapOut(num) {
  eval("document.nav" +num).src = OnImage[num].src;
  return true;
} 

function SwapBack(num){
  eval("document.nav" +num).src = OffImage[num].src;
  return true;
}


OffImage = new Array()
OnImage = new Array()
   
OffImage[0] = new Image() 
OffImage[0].src = "/img/nav_home_off.gif" 
OnImage[0] = new Image()
OnImage[0].src = "/img/nav_home_on.gif"
   
OffImage[1] = new Image() 
OffImage[1].src = "/img/nav_film_off.gif" 
OnImage[1] = new Image()
OnImage[1].src = "/img/nav_film_on.gif"
   
OffImage[2] = new Image() 
OffImage[2].src = "/img/nav_invest_off.gif" 
OnImage[2] = new Image()
OnImage[2].src = "/img/nav_invest_on.gif"
   
OffImage[3] = new Image() 
OffImage[3].src = "/img/nav_about_off.gif" 
OnImage[3] = new Image()
OnImage[3].src = "/img/nav_about_on.gif"