if (document.images) 

{
    
button1 = new Image
button2 = new Image

button1.src = 'images/home_off.gif'
button2.src = 'images/home_on.gif'
	 
button3 = new Image
button4 = new Image

button3.src = 'images/services_off.gif'
button4.src = 'images/services_on.gif'
	 	 
button5 = new Image
button6 = new Image

button5.src = 'images/company_off.gif'
button6.src = 'images/company_on.gif'
	 	 
button7 = new Image
button8 = new Image

button7.src = 'images/contact_off.gif'
button8.src = 'images/contact_on.gif'

}