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 isValidPath(path)
{
  var result = false;
  var theStr = new String(path);
  var index1 = theStr.indexOf(":");
  var index2 = theStr.indexOf(unescape("%5C"));
  if ((index1 > 0) && (index2 > 0))
	  index = 1;
  if (index == 1)
  {
    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('The field "' + fieldLabel +'" has to be filled!');
    formField.focus();
    result = false;
  }
  
  return result;
}

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("Please, check that the email address is correctly filled out!");
    formField.focus();
    result = false;
  }
   
  return result;

}

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

  if (result && ((formField.value.length < 5) || !isValidPath(formField.value)) )
  {
    alert("Please, check that the path to the choosen file is correct!");
    //formField.focus();
	//alert(formField.value);
    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,10);
     if (isNaN(num))
     {
       alert('The field "' + fieldLabel +'" must contain a number!');
      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 year = parseInt(elems[0],10);
        var month = parseInt(elems[1],10);
       var day = parseInt(elems[2],10);
      result = !isNaN(month) && (month > 0) && (month < 13) &&
            !isNaN(day) && (day > 0) && (day < 32) &&
            !isNaN(year) && (elems[0].length == 4);
     }
     
      if (!result)
     {
       alert('The field "' + fieldLabel +'" must contain a date in the format [yyyy-mm-dd] !');
      formField.focus();    
    }
  } 
  
  return result;
}

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

  for(var i=0; i<formField.options.length; i++) 
  {
	if(formField.options[i].selected && formField.options[i].value == "")
	{
	  alert('Select an item in the the list "' + fieldLabel +'" !');
      formField.focus();
      result = false;
	}
  }
  
  return result;
}