function test_all_dates() {
	if (!test_date(document.searchform.proj_start_after))
		return false;
	else if (!test_date(document.searchform.proj_start_before))
		return false;
	else
		return true;	
}

function test_date(fld) {
	var Ausdruck = /^\d\d\.\d\d\.\d\d\d\d$/;
	if ((Ausdruck.test(fld.value) == false) && (fld.value != '')) {
		alert('"' + fld.value + '" ist kein gültiges Datum!');
		return false;
	} else {
		return true;
	}
}