var VALID = "valid"; // flag means validation is Ok

function Adresseneingabe_pruefen()
{
	var valRes = validateText("Name", document.getElementsByName("Name1")[0].value); 
	if (valRes != VALID) {
		Error(document.getElementsByName("Name1")[0], valRes);
		return false;
	}
	if(document.getElementsByName("Name2")[0].value != "") {
		valRes = validateText("Name", document.getElementsByName("Name2")[0].value); 
		if (valRes != VALID) {
			Error(document.getElementsByName("Name2")[0], valRes);
			return false;
		}
	}
	valRes = validateText("Strasse", document.getElementsByName("Strasse")[0].value); 
	if (valRes != VALID) {
		Error(document.getElementsByName("Strasse")[0], valRes);
		return false;
	}
	valRes = validatePLZ("PLZ", document.getElementsByName("PLZ")[0].value); 
	if (valRes != VALID) {
		Error(document.getElementsByName("PLZ")[0], valRes);
		return false;
	}
	valRes = validateText("Ort", document.getElementsByName("Ort")[0].value); 
	if (valRes != VALID) {
		Error(document.getElementsByName("Ort")[0], valRes);
		return false;
	}
	return true;
}

function Error(elem, text) {
	window.alert(text);
	elem.select();
	elem.focus();
}

function validateNotEmpty(field, text) {
	if (text.length == 0) {
		return field + " darf nicht leer sein!";
	}
	return VALID;
}

function validateNotAllowedChars(field, text) {
	var chars = "\"';";
	for (i = 0; i < text.length; i++) {
		if (chars.indexOf(text.charAt(i), 0) != -1) {
			return field + " darf keine \", \; und ' Zeichen enthalten!";
		}
	}
	return VALID;
}

function validateText(field, text) {
	var valRes = validateNotEmpty(field, text);
	if (valRes == VALID) {
		valRes = validateNotAllowedChars(field, text);
	}
	return valRes;
}

function validatePLZ(field, text) {
	var valRes = validateText(field, text);
	if (valRes == VALID) {
		var digits = "0123456789";
		var maxlength = 5;
		if (text.length != maxlength) {
			return field + " soll 5-stellig sein!";
		}
		if (text == "00000") { 
			return field + " darf keine 0 sein!";
		}
		for (i = 0; i < text.length; i++ ) {
			if (digits.indexOf(text.charAt(i), 0) == -1) {
				return field + " darf nur Ziffern enthalten!";
			}
		}
		valRes = VALID;
	}
	return valRes;
}