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 emailChar(email)
	{
	  var result = true;
	  var validchars = "abcdefghijklmnopqrstuvwxyz0123456789@.-_";
	
		for (var i=0; i < email.length; i++) 
		{
			var letter = email.charAt(i).toLowerCase();
			if (validchars.indexOf(letter) != -1)		
			  continue;		
			result = false;
			break;
		}	
	
	  return result;
	}
	
	//===============================================================================
	
	function validRequired(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 (required && !validRequired(formField,fieldLabel))
		result = false;
	
	  if (result && ((formField.value.length < 3) || !isEmailAddr(formField.value)) )
	  {
		alert("Please enter an email address in the form: yourname@yourdomain.com");
		formField.focus();
		result = false;
	  }
	  
		else if (result && ((formField.value.length < 3) || !emailChar(formField.value)) )
		{
			alert('That email address contains invalid characters.');
			formField.focus();
			result = false;
		}
	   
	  return result;
	}
	
	//===============================================================================
	
	function validateForm(theForm)
	{
	  // Customize these calls for your form
	
	  // Start ------->
if (!validRequired(theForm.contactname,"Name"))
	return false;
if (!validRequired(theForm.email,"Email"))
	return false;
if (!validRequired(theForm.telnum,"Telephone Number"))
	return false;	
if (!validRequired(theForm.enquiry,"Enquiry"))
	return false;
// <--------- End
	  
	  return true;
	}