function validate (aForm)
{
	var form = aForm ? aForm : document.forms[0];
	if (form.terms && form.terms.value != "") return true;
	if (form.creator && form.creator.selectedIndex > 0) return true;
	if (form.categories && form.categories.selectedIndex > 0) return true;

	alert (String_Search_Brief);
	form.terms.focus ();
	return false;
}

function addDescriptor (id, term, form)
{
	if (!form) form = document.forms[1];
	field = form.terms;
	if (field.value.length > 0)
		field.value += ' ';
	if (term.indexOf (' ') != -1)
		field.value += '\"' + term + '\"';
	else
		field.value += term;
}