// PRELOADING IMAGES
if (document.images)
{
	img1_on = new Image();  
	img1_on.src ="images/icon_home.gif"; 
	img1_off= new Image();  
	img1_off.src="images/icon_home_grey.gif"; 
	
	img2_on = new Image();  
	img2_on.src ="images/icon_software.gif"; 
	img2_off= new Image();  
	img2_off.src="images/icon_software_grey.gif";
	
	img3_on = new Image();  
	img3_on.src ="images/icon_retail.gif"; 
	img3_off= new Image();  
	img3_off.src="images/icon_retail_grey.gif";
	
	img4_on = new Image();  
	img4_on.src ="images/icon_contact.gif"; 
	img4_off= new Image();  
	img4_off.src="images/icon_contact_grey.gif";
}

function handleOver(k)
{
	 if (document.images) 
		eval('document.img'+k+'.src=img'+k+'_on.src');
}

function handleOut(k)
{
	 if (document.images) 
		eval('document.img'+k+'.src=img'+k+'_off.src');
}