if (document.images) {
     button1 = new Image
     button2 = new Image
     button3 = new Image
     button4 = new Image
     button5 = new Image
     button6 = new Image
     button7 = new Image
     button8 = new Image
     button9 = new Image
     button10 = new Image
     button11 = new Image
     button12 = new Image
 
	 button1.src = 'graphics/about.jpg'
     button2.src = 'graphics/about_js.jpg'
	 
	 button3.src = 'graphics/artists.jpg'
     button4.src = 'graphics/artists_js.jpg'
	 
	 button5.src = 'graphics/roster.jpg'
     button6.src = 'graphics/roster_js.jpg'
	 
	 button7.src = 'graphics/go.jpg'
     button8.src = 'graphics/go_js.jpg'
	 
	 }