function isEmailAddr(email)
{
  var result = false;
  var theStr = new String(email);
  var index = theStr.indexOf("@");
  if (index > 0)
  {
    var pindex = theStr.indexOf(".",index);
    if ((pindex > index+1) && (theStr.length > pindex+1))
	result = true;
  }
  return result;
}

function validRequired(formField,fieldLabel)
{
	var result = true;
	
	if (formField.value == "")
	{
		alert('Das Feld "' + fieldLabel +'" ist ein Pflichtfeld !.');
		formField.focus();
		result = false;
	}
	
	return result;
}

function validRequiredOne(formField1,fieldLabel1,formField2,fieldLabel2,formField3,fieldLabel3)
{
	var result = true;
	
	if ( (formField1.value == "") && (formField2.value == "") && (formField3.value == "") )
	{
		alert('Eines der Felder "' + fieldLabel1 + ', ' +  fieldLabel2 + ' oder ' + fieldLabel3 + '"ist Pflichtfeld.');
		formField1.focus();
		result = false;
	}
	
	return result;
}


function validBarcode(strBarcode)
{
	var theStr = new String(strBarcode);
	nLen = theStr.length;
	if (nLen != 20) {
		alert("Der Barcode umfaßt genau 20 Stellen");
		return false;	
	} else {
		strFirst3 = theStr.substr(0, 3);
		if (strFirst3 != "003") {
			alert("Der Barcode muß mit 003 beginnen !");
			return false;
		}
	}
	
	return true;

}


function validEmail(formField,fieldLabel,required)
{
	var result = true;
	
	if (required && !validRequired(formField,fieldLabel))
		result = false;

	if (result && ((formField.value.length < 3) || !isEmailAddr(formField.value)) )
	{
		alert("Bitte erfassen Sie Ihre E-Mail Angaben in der Form Ihrname@Ihredomain");
		formField.focus();
		result = false;
	}
   
  return result;

}


function validNum(formField,fieldLabel,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;
  
 	if (result)
 	{
 		var num = parseInt(formField.value);
 		if (isNaN(num))
 		{
 			alert('Bitte erfassen Sie einen numerischen Wert im Feld "' + fieldLabel +'" .');
			formField.focus();		
			result = false;
		}
	} 
	
	return result;
}


function validPosIntNum(formField,fieldLabel,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;

 	if (result)
 	{

		var elemsComma = formField.value.split(",");
			
		var elemsDot = formField.value.split(".");

	 	result = (elemsComma.length > 1) || (elemsDot.length > 1); 

 		if (!result) 
 		{
 			var num = parseInt(formField.value);
			if (isNaN(num)) {
	 			alert('Bitte erfassen Sie einen ganzzahligen Wert im Feld "' + fieldLabel +'" .');
				formField.focus();		
				result = false;
			} else {
				if (formField.value > 0) {
					result = true;
				}
				else {
		 			alert('Bitte erfassen Sie einen ganzzahligen Wert im Feld "' + fieldLabel +'" .');
					formField.focus();		
					result = false;
				} 
				
			}

		} else {
			alert('Bitte erfassen Sie einen ganzzahligen Wert im Feld "' + fieldLabel +'" .');
			formField.focus();		
			result = false;
		}
	} 
	
	return result;
}


function validDate(formField,fieldLabel,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;
  
 	if (result)
 	{
 		var elems = formField.value.split("/");
 		
 		result = (elems.length == 3); // should be three components
 		
 		if (result)
 		{
 			var month = parseInt(elems[1]);
  			var day = parseInt(elems[0]);
 			var year = parseInt(elems[2]);
			result = !isNaN(month) && (month > 0) && (month < 13) &&
						!isNaN(day) && (day > 0) && (day < 32) &&
						!isNaN(year) && (elems[2].length == 4);
 		}
 		
  		if (!result)
 		{
 			alert('Bitte erfassen Sie das Datum in der Form TT/MM/JJJJ im Feld "' + fieldLabel +'" .');
			formField.focus();		
		}
	} 
	
	return result;
}

function validDate2(formField,fieldLabel,strSeparator,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;
  
 	if (result)
 	{
 		var elems = formField.value.split(strSeparator);
 		
 		result = (elems.length == 3); // should be three components
 		
 		if (result)
 		{
//			var month = parseInt(elems[1]);
//			var day = parseInt(elems[0]);
//			var year = parseInt(elems[2]);
			var month = elems[1];
			var day = elems[0];
			var year = elems[2];
			result = !isNaN(month) && (month > 0) && (month < 13) &&
						!isNaN(day) && (day > 0) && (day < 32) &&
						!isNaN(year) && (elems[2].length == 4);
 		}
 		
  		if (!result)
 		{
 			alert('Bitte erfassen Sie das Datum in der Form TT' + strSeparator + 'MM' + strSeparator + 'JJJJ im Feld "' + fieldLabel +'" .');
			formField.focus();		
		}
	} 
	
	return result;
}

function validTime(formField,fieldLabel,strSeparator,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;
  
 	if (result)
 	{
 		var elems = formField.value.split(strSeparator);
 		
 		result = (elems.length == 2); // should be three components
 		
 		if (result)
 		{
 			var Hour = parseInt(elems[0]);
  			var Minutes = parseInt(elems[1]);
			result = !isNaN(Hour)  && (Hour >= 0) && (Hour < 24) &&
						!isNaN(Minutes) && (Minutes >= 0) && (Minutes < 60) &&
						(elems[1].length == 2);
 		}
 		
  		if (!result)
 		{
 			alert('Bitte erfassen Sie die Zeit in der Form ss' + strSeparator + 'mm im Feld "' + fieldLabel +'" .');
			formField.focus();		
		}
	} 
	
	return result;
	
}