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
     button13 = new Image
     button14 = new Image
    
	 button1.src = '../images/button_1a.jpg'
     button2.src = '../images/button_1b.jpg'
	 button3.src = '../images/button_2a.jpg'
     button4.src = '../images/button_2b.jpg'
	 button5.src = '../images/button_3a.jpg'
     button6.src = '../images/button_3b.jpg'
     button7.src = '../images/button_4a.jpg'
     button8.src = '../images/button_4b.jpg'
     button9.src = '../images/button_5a.jpg'
     button10.src = '../images/button_5b.jpg'
     button11.src = '../images/button_6a.jpg'
     button12.src = '../images/button_6b.jpg'
	 button13.src = '../images/button_7a.jpg'
     button14.src = '../images/button_7b.jpg'
 }