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('Please enter a value for the "' + fieldLabel +'" field.');
    formField.focus();
    formField.select();
    result = false;
  }
  
  return result;
}

function validTotalRequired(formField,fieldLabel)
{
  var result = true;
  
  if (formField.value == "0")
  {
    alert('' + fieldLabel +'.');
    formField.focus();
    formField.select();
    result = false;
  }
  
  return result;
}

 
function validRequiredCombo(formField,fieldLabel)
{
  var result = true;
  
  if (formField.value == "")
  {
    alert('Please enter a value for the "' + fieldLabel +'" field.');
    formField.focus();
    result = false;
  }
  
  return result;
}
 
function validEmail(formField,fieldLabel,required)
{
  var result = true;
  
  if (!validRequired(formField,fieldLabel))
    result = false;
 
  if (result && ((formField.value.length < 3) || !isEmailAddr(formField.value)) )
  {
    alert("Please enter a complete email address in the form: yourname@yourdomain.com");
    formField.focus();
    formField.select();
    result = false;
  }
   
  return result;
 
}
 
function validNum(formField,fieldLabel,required)
{
  var result = true;
  
  if (!validRequired(formField,fieldLabel))
    result = false;
  
   if (result)
   {
     //var num = parseInt(formField.value,10);
   var num = formField.value;
   var spaces = num.length;
   for(var x = 1; x<spaces; ++x){
    num = num.replace(",", "");   
   }
 
     if (isNaN(num))
     {
      alert('Please enter a number for the "' + fieldLabel +'" field.');
      formField.focus();
      formField.select(); 
      result = false;
     }
  }
 
  return result;
}
 
function validDate(formField,fieldLabel,required)
{
  var result = true;
 
  if (!validRequired(formField,fieldLabel))
    result = false;
  
   if (result)
   {
     var elems = formField.value.split("/");
     
     result = (elems.length == 2); // should be three components
     
     if (result)
     {
      var month = parseInt(elems[0],10);
      //var day = parseInt(elems[1],10);
      var year = parseInt(elems[1],10);
      result = !isNaN(month) && (month > 0) && (month < 13) &&
            !isNaN(day) && (day > 0) && (day < 32) &&
            !isNaN(year) && (elems[1].length == 2);
     }
     
      if (!result)
     {
       alert('Please enter a date in the format MM/YY for the "' + fieldLabel +'" field.');
       formField.focus();
       formField.select();
     }
     
    } 
  
  return result;
}
 
function validTime(formField,fieldLabel,required)
{
 var result = true;
 
  if (!validRequired(formField,fieldLabel))
    result = false;
 
 if (result)
 {
  var value = formField.value;
   var hasMeridian = false;
   var re = /^\d{1,2}[:]\d{2}([:]\d{2})?( [aApP][mM]?)?$/;
   if (!re.test(value)) { 
    formField.focus();
    formField.select();
    result = false;
   }
   if (value.toLowerCase().indexOf("p") != -1) { hasMeridian = true; }
   if (value.toLowerCase().indexOf("a") != -1) { hasMeridian = true; }
   var values = value.split(":");
   if ( (parseFloat(values[0]) < 0) || (parseFloat(values[0]) > 23) ) { 
    formField.focus();
    formField.select();
    result = false;
   }
   if (hasMeridian) {
      if ( (parseFloat(values[0]) < 1) || (parseFloat(values[0]) > 12) ) { 
      formField.focus();
      formField.select();
      result = false;
     }
   }
   if ( (parseFloat(values[1]) < 0) || (parseFloat(values[1]) > 59) ) { 
    formField.focus();
    formField.select();
    result = false;
   }
 
   if (values.length > 2) {
      if ( (parseFloat(values[2]) < 0) || (parseFloat(values[2]) > 59) ) { 
      formField.focus();
      formField.select();
      result = false;
     }
   }
   
   if (!result) {
    alert('Please enter a time in the format HH:MM for the "' + fieldLabel +'" field.');
   }
 
  }
  
  return result;
}
 
/*Apply this section to the specific page that is using the code
function validateForm(theForm)
{
  // Customize these calls for your form
 
  // Start ------->
  if (!validRequired(theForm.username,"User Name"))
    return false;
 
  if (!validEmail(theForm.email,"Email Address",true))
    return false;
 
  if (!validDate(theForm.birthdate,"Birth Date",true))
    return false;
 
  if (!validNum(theForm.convAmount,"Conversion Amount",true))
    return false;
 
  // <--------- End
  
  return true;
}
*/
 
/*How to Use
<form method="GET" action="blformvalidate.htm" onsubmit="return validateForm(this)">
  <p>User Name: <input type="text" name="username" size="32"><br>
  Email Address: <input type="text" name="email" size="32"><br>
  Birth Date: <input type="text" name="birthdate" size="16"><i>(mm/dd/yyyy)</i>
  </p>
  <p><input type="submit" value="Register" name="submit"></p>
</form>
*/