/**
 * @author gharbusch
 */
 
function clearTarif(formName){ 
	var form = document.forms[formName]; 
	form.tarif.value = ''; 
} 

function calculate(formName) { 
	var form = document.forms[formName] 
 	 
	if (formName == 'Inland') { 
		var timezone1 = ''; 
		var timezone2 = ''; 
		for (i = 0; i < form.weekday.length; i++) { 
			if (form.weekday[i].checked) { 
				timezone1 = form.weekday[i].value; 
				break; 
			} 
		} 
		var timezone2 = form.time.options[form.time.selectedIndex].value; 
		if (timezone1 != '' && timezone2 != '') { 
			var festnetz = tarife[formName]['Festnetz'][timezone1][timezone2]; 
			form.tarif.value = festnetz; 
		} 
 	} 
 	if (formName == 'AFest') { 
		var price = '';
		if (form.laenderzone.selectedIndex != 0) { 
			price            = form.laenderzone.options[form.laenderzone.selectedIndex].value; 
			form.tarif.value = price; 
		} else { 
			alert('Bitte wählen Sie zunächst ein Land aus!'); 
 		}      
 	} 
	if (formName == 'AMobil') { 
		var price = '';
		if (form.laenderzone.selectedIndex != 0) { 
			price            = form.laenderzone.options[form.laenderzone.selectedIndex].value; 
			form.tarif.value = price; 
		} else { 
			alert('Bitte wählen Sie zunächst ein Land aus!'); 
 		}      
 	} 
}