function openwiki(keyword)
{
	wikiurl = 'http://de.wikipedia.org/wiki/';
	
	if (screen.width == 800) mw = 750;
	else mw = screen.width - 200;

	if (screen.heigth == 600) mh = 500;
	else mh = screen.height - 150;
	
	var wikiobj = open(wikiurl+keyword,'WIKIPEDIA','width='+mw+',height='+mh+',scrollbars=yes');
	
	if (!navigator.appName.indexOf('MSIE'))
		wikiobj.moveTo((screen.width/2)-(mw/2), (screen.height/2)-((mh/2)+50));
	
	wikiobj.focus();	
}

function guestcheckform()
{
	if (document.guestbook.comment.value.length > 0) return true;
	else {
	  alert('Bitte einen Kommentar schreiben.');
	  return false;
	}
}

function counttokens()
{
   var divid = document.getElementById('count');
 
   freetokens = 512 - document.guestbook.comment.value.length;
   divid.innerHTML = 'noch <b>'+freetokens+'</b> Zeichen verf&uuml;gbar<br>';  
}