function image_on(imageid, img) { 
	if(img == undefined) img = 'next_on.gif';	  
	document.images[imageid].src = '/ticons/' + img;
}

function image_off(imageid, img) {
		if(img == undefined) img = 'next.gif';	  
		document.images[imageid].src = '/ticons/' + img;
}