if (document.images) {
     button1 = new Image
     button2 = new Image
	 button3 = new Image
     button4 = new Image
	 button5 = new Image
     button6 = new Image

     button1.src = 'images/img1.gif'
     button2.src = 'images/img2.gif'
	 
	 button3.src = 'images/img3.gif'
     button4.src = 'images/img4.gif'
	 
	 button5.src = 'images/img5.gif'
     button6.src = 'images/img6.gif'
}