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
	 
	 button15 = new Image
     button16 = new Image
	 
	 button1.src = 'images/home.jpg'
     button2.src = 'images/home-hover.jpg'
	 
	  button3.src = 'images/splitsys.jpg'
     button4.src = 'images/splitsys-hover.jpg'
	 
	  button5.src = 'images/aircon.jpg'
     button6.src = 'images/aircon-hover.jpg'
	 
	  button7.src =  'images/c-splitsys.jpg'
     button8.src = 'images/c-splitsys-hover.jpg'
	 
	  button9.src = 'images/c-aircon.jpg'
     button10.src = 'images/c-aircon-hover.jpg'
	 	 
	  button11.src = 'images/gas.jpg'
     button12.src = 'images/gas-hover.jpg'
	 
	  button13.src = 'images/mitsubishi.jpg'
     button14.src = 'images/mitsubishi-hover.jpg'
	 
	  button15.src = 'images/x.jpg'
     button16.src = 'images/x-hover.jpg'
 }