function checkErrorKontaktFormular()
{
	// 1. Create some variables for our script
	var lastnameEntered = "";
	var firstnameEntered = "";
	var streetEntered = "";
	var plzEntered = "";
	var cityEntered = "";
	var emailEntered = "";
	var requiredFieldsErrorMessage = "";
	var emailErrorMessage = "";

	// 2. Check the required fields
	lastnameEntered = document.forms['kontaktformular'].elements['var_lastname'].value;
	firstnameEntered = document.forms['kontaktformular'].elements['var_firstname'].value;
	streedEntered = document.forms['kontaktformular'].elements['var_street'].value;
	plzEntered = document.forms['kontaktformular'].elements['var_plz'].value;
	cityEntered = document.forms['kontaktformular'].elements['var_city'].value;
	emailEntered = document.forms['kontaktformular'].elements['var_email'].value;

	if ((!emailEntered))
	{
		if (!emailEntered)
		{
			requiredFieldsErrorMessage = "- E-Mail";
		}
	}
	
	if ((!cityEntered))
	{
		if (!-cityEntered)
		{
			requiredFieldsErrorMessage = "- Ort";
		}
	}
	
	if ((!plzEntered))
	{
		if (!-plzEntered)
		{
			requiredFieldsErrorMessage = "- PLZ";
		}
	}
	
	
	if ((!streedEntered))
	{
		if (!-streetEntered)
		{
			requiredFieldsErrorMessage = "- Adresse";
		}
	}
	
	if ((!firstnameEntered))
	{
		if (!-firstnameEntered)
		{
			requiredFieldsErrorMessage = "- Vorname";
		}
	}
	
	if ((!lastnameEntered))
	{
		if (!lastnameEntered)
		{
			requiredFieldsErrorMessage = "- Name";
		}
	}
	

	


	// 3. Check the e-mail address format
	if (emailEntered)
	{
		emailEntered = document.forms['kontaktformular'].elements['var_email'].value;

		emailValue = new String (emailEntered);
		emailHasAt = emailValue.indexOf("@");
		emailHasPeriod = emailValue.indexOf(".");

		if ((emailHasAt == -1) || (emailHasPeriod == -1))
		{
			emailErrorMessage = "- Ihre E-Mail Adresse (ungültig)\r";
		}

	}

	// 4. Letting the user know what was missed
	if ((requiredFieldsErrorMessage) || (emailErrorMessage))
	{
		alertMessage = "Die folgenden Felder sind obligatorisch:\r";
		alertMessage = alertMessage + requiredFieldsErrorMessage;
		alertMessage = alertMessage + emailErrorMessage;
		alert (alertMessage);
	}
	else	// there is no problem with the form
	{
	document.forms['kontaktformular'].submit();
	}
}