// form_validation v. 2.0
//  ----------------------------
// | Euroweb Internet GmbH     |
//  ----------------------------
//	Last changed:	08. 09. 2006



function validateForm(formular) 
{
	var error = 0;
	var currentLabel = '';
	var currentField = '';
	var klasse = '';
	var newClass = '';
	
	
// Inspect all of the document's labels ...
	
for (var i = 0; i < document.getElementsByTagName("label").length; i++) 
   {
      currentLabel = document.getElementsByTagName("label")[i];

      currentField = document.getElementById(currentLabel.htmlFor);
      klasse = currentLabel.className;

      newClass = currentLabel.className.replace(/ error/, '');
      // Check if the current label belongs to the form we want to validate
      if (currentLabel.form == formular && currentField) 
      {
         // ...  and if it is required at all, or has to be a number, or an e-mail address.

         // Rueckruf exists: Mark phone number field as required

         if (currentField.name == 'Rueckruf') 
         {
            if (currentField.checked == true) 
            {
               document.getElementById('label-telefon').className += ' required rueckruf';
            } 
            else 
            {
               var newTelClass = document.getElementById('label-telefon').className.replace(/ required rueckruf/, '');
               document.getElementById('label-telefon').className = newTelClass;
            }
         }

         // required field (but neither numeric nor an e-mail)
         if (klasse.match(/required/)) 
         {
            if (currentField.value == '') 
            {
               currentLabel.className = newClass;
               currentLabel.className += ' error';
               error = 1;
            } 
            else
            {
               currentLabel.className = newClass;
            }
         }
         // numeric field
         if (klasse.match(/number/)) 
         {
            var numeric = isNumber(currentField);
            if (!numeric && !klasse.match(/required/) && currentField.value != '') 
            {
               currentLabel.className = newClass;
               currentLabel.className += ' error';
               error = 1;
            }
            else
            {
               currentLabel.className = newClass;
            }
            if (!numeric && klasse.match(/required/))
            {
               currentLabel.className = newClass;
               currentLabel.className += ' error';
               error = 1;
            }
            else
            {
               if (error == 0) 
               {
                  currentLabel.className = newClass;
               }
            }
            // e-mail address
            if (klasse.match(/mail/))
            {
               var valid = isMailValid(currentField);
               if (!valid && currentField.value != '') 
               { 
                  currentLabel.className = newClass;
                  currentLabel.className += ' error';
                  error = 1;
               }
               else
               {

                  currentLabel.className = newClass;
               }
               if (!valid && klasse.match(/required/)) 
               { 
                  currentLabel.className = newClass;
                  currentLabel.className += ' error';
                  error = 1;
               } 
               else 
               {
                  if (error == 0) 
                  {
                     currentLabel.className = newClass;
                  }
               }
            }
         }
      }
      // end for
      // Return TRUE and proceed sending the form if no errors occured.

      // Return FALSE in case of errors and display the error message,
      // then focus on the ID of the element containing the error message.
      // (The window.location.href call comes in handy if the page containing
      // the form is as high as serveral screens,

      // but can be safely removed without preventing the script to function properly).

      if (error === 0) 
      {
         return true;
      }
         else
      {
         document.getElementById("fehlermeldung").style.display = 'block';
         window.location.href = "#fehlermeldung";
         return false;
      }

   }
   // Additional functions for numeric and e-mail validation

function isNumber(field) {
	var returnvar = (isNaN(parseInt(field.value)) == true) ? false : true;
	return returnvar;
}

function isMailValid(field) {
	var returnvar = (field.value.match(/^[\w\.\-]+@([\w\-]+\.)+[a-zA-Z]+$/)) ? true : false;
	return returnvar;
}