if (document.images) {
     button1 = new Image
     button2 = new Image
	 button3 = new Image
	 button4 = new Image
	 button5 = new Image


     button1.off = 'images/crew/images/amber-roll-off.gif'
     button1.on  = 'images/crew/images/amber-roll-on.gif' 
	 
	 button2.off = 'images/crew/images/michael-roll-off.gif'
	 button2.on  = 'images/crew/images/michael-roll-on.gif'  
	 
	 button3.off = 'images/crew/images/hume-roll-off.gif'
	 button3.on  = 'images/crew/images/hume-roll-on.gif'
	 
	 button4.off = 'images/crew/images/laura-roll-off.gif'
	 button4.on  = 'images/crew/images/laura-roll-on.gif'
	 
	 button5.off = 'images/crew/images/sarah-roll-off.gif'
	 button5.on  = 'images/crew/images/sarah-roll-on.gif'
	 
 }