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	 

	 	 

     button1.src = 'images/btn_product_services.jpg'
     button2.src = 'images/btn_products_services_over.jpg'	 

	 button3.src = 'images/btn_our_partners.jpg'
     button4.src = 'images/btn_our_partners_over.jpg'	 

	 button5.src = 'images/btn_energy_auditing.jpg'
     button6.src = 'images/btn_energy_auditing_over.jpg'	 

	 button7.src = 'images/btn_benefits.jpg'
     button8.src = 'images/btn_benefits_over.jpg'	 

	 button9.src = 'images/btn_grants.jpg'
     button10.src = 'images/btn_grants_over.jpg'
}