function secret(bloc)
{
	var divs = bloc.getElementsByTagName('div');
	var div = divs[0];
	if (div.style.visibility == 'visible')
		div.style.visibility = 'hidden';
	else
		div.style.visibility = 'visible';
return true;
}

function preview(textareaId, previewDiv) {
	var field = textareaId.value;
	if (field) {

		field = field.replace(/&/g, '&');
		field = field.replace(/</g, '&lt;').replace(/>/g, '&gt;');
		field = field.replace(/\n/g, '<br />').replace(/\t/g, '&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;');
		
		field = field.replace(/\[b\]([\s\S]*?)\[\/b\]/g, '<strong>$1</strong>');
		field = field.replace(/\[i\]([\s\S]*?)\[\/i\]/g, '<em>$1</em>');
		field = field.replace(/\[lien\]([\s\S]*?)\[\/lien\]/g, '<a href="$1">$1</a>');
		field = field.replace(/\[lien="([\s\S]*?)"&gt;([\s\S]*?)\[\/lien\]/g, '<a href="$1" title="$2">$2</a>');
		field = field.replace(/\[soustitre\]([\s\S]*?)\[\/soustitre\]/g, '<h4>$1</h4>');

		
		document.getElementById(previewDiv).innerHTML = field;
	}
}