function gb_verify() {
	var verify = Math.random();
	if (document.getElementById('gb_verify'))
		document.getElementById('gb_verify').innerHTML ='<input type="hidden" name="verify" value="'+verify+'" />';
}
function vorschau() {
	var textarea = document.getElementsByTagName('textarea')[0].value.split('[');
	vorschautext = textarea[0];
	for (var i=0; i<textarea.length; i++) {
		bracket = textarea[i].split(']')[0];
		if (bracket == 'b') {vorschautext += '<span style="font-weight: bolder;">' + textarea[i].split('b]')[1].split('/b]')[0];}
		if (bracket == 'i') {vorschautext += '<span style="font-style: italic;">' + textarea[i].split('i]')[1].split('/i]')[0];}
		if (bracket == 'u') {vorschautext += '<span style="text-decoration: underline;">' + textarea[i].split('u]')[1].split('/u]')[0];}
		if (bracket == '/b' || bracket == '/i' || bracket == '/u') {vorschautext += '</span>' + textarea[i].split(']')[1];}
		else {
			if (document.getElementById(bracket) && bracket != '') 	vorschautext +=  '<img src="'+document.getElementById(bracket).src+'">'+textarea[i].split(']')[1];
	}	}
	vorschau_window = window.open('',"Vorschau","toolbar=no,width=550,height=200,directories=no,scrollbars,status=no,menubar=no,resizable=yes");
	vorschau_window.document.open();
	vorschau_window.document.writeln('<html><head>');
	vorschau_window.document.writeln('<title>Vorschau</title>');
	vorschau_window.document.writeln('</head><body onblur="self.close()">');
	vorschau_window.document.writeln('<p>'+vorschautext.replace(/\n/g, '<br />')+'</p>');
	vorschau_window.document.writeln('<div style="position:absolute;right:3px;bottom:3px;"><a href="javascript:" onclick="self.close()">Schließen</a></div>');
	vorschau_window.document.writeln('</body></html>');
	vorschau_window.document.close();
	vorschau_window.focus();
}