function headerad(targetad) {
		// if targetad = ''random'' do the random thing
	// else use filename in targetad parameter 
document.write('<a href="#"><img src="../img/guides/ad-header.jpg" alt="Advertisement" /></a>');
}

function rightad(targetad) {
	// if targetad = ''random'' do the random thing
	// else use filename in targetad parameter 
document.write('<a href="#"><img src="../img/guides/ad-right.jpg" alt="Advertisement" /></a>');
}