if(document.images)
{
	abouton = new Image; aboutoff = new Image;
		abouton.src = "/img/about_on.gif";
		aboutoff.src = "/img/about_off.gif";
	
	webon = new Image; weboff = new Image;
		webon.src = "/img/web_on.gif";
		weboff.src = "/img/web_off.gif";
	
	printon = new Image; printoff = new Image;
		printon.src = "/img/print_on.gif";
		printoff.src = "/img/print_off.gif";
	
	illustrationon = new Image; illustrationoff = new Image;
		illustrationon.src = "/img/illustration_on.gif";
		illustrationoff.src = "/img/illustration_off.gif";
	
	miscon = new Image; miscoff = new Image;
		miscon.src = "/img/misc_on.gif";
		miscoff.src = "/img/misc_off.gif";
}
function swap(imageon, imageoff)
{
	if(document.images)
	{
		imageon.src = imageoff.src;
	}
}