/**
 * Gesamtpersonenzahl berechnen
 * @copyright (c) 2009 F. Voigt (MHV-GmbH)
 * @version 1.0
 */

function addPersons() {
	var x1 = (document.getElementById('anzahl').value);
	var x2 = (document.getElementById('anzahl2').value);
	var x3 = (document.getElementById('anzahl3').value);
	var x4 = (document.getElementById('anzahl4').value);

	if (x1 == 'NaN') { pers1 = 0; } else { pers1 = x1*1; }
	if (x2 == 'NaN') { pers2 = 0; } else { pers2 = x2*2; }
	if (x3 == 'NaN') { pers3 = 0; } else { pers3 = x3*3; }
	if (x4 == 'NaN') { pers4 = 0; } else { pers4 = x4*4; }

	document.getElementById('gaeste').value = pers1+pers2+pers3+pers4;
}