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	img1on.src = "images/page-button-what-how-white.gif";  
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	img3on = new Image();           
	img3on.src = "images/page-button-what-happens-white.gif";  
	img4on = new Image();
	img4on.src = "images/page-button-who-why-white.gif";
	img5on = new Image();
	img5on.src = "images/page-button-related-links-white.gif";
	img6on = new Image();
	img6on.src = "images/page-button-tya-frame-white.gif";  
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	img1off.src = "images/page-button-what-how.gif"; 
	img2off = new Image();
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