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();
		result = false;
	}
	
	return result;
}

function allDigits(str)
{
	return inValidCharSet(str,"0123456789");
}

function inValidCharSet(str,charset)
{
	var result = true;

	// Note: doesn't use regular expressions to avoid early Mac browser bugs	
	for (var i=0;i<str.length;i++)
		if (charset.indexOf(str.substr(i,1))<0)
		{
			result = false;
			break;
		}
	
	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 a complete email address in the form: yourname@yourdomain.com");
		formField.focus();
		result = false;
	}
   
  return result;

}

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

	if (required && !validRequired(formField,fieldLabel))
		result = false;
  
 	if (result)
 	{
 		if (!allDigits(formField.value))
 		{
 			alert('Please enter a number for the "' + fieldLabel +'" field.');
			formField.focus();		
			result = false;
		}
	} 
	
	return result;
}


function MM_jumpMenu(targ,selObj,restore){ //v3.0
  eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");
  if (restore) selObj.selectedIndex=0;
}


function validateForm(theForm)
{
  var returnValue;

  var xhr;
  try 
  {
	  xhr = new XMLHttpRequest();
  } catch (error)
  {
	try
	{
		  xhr = new ActiveXObject('Microsoft.XMLHTTP');
	} catch (error)
	{
		  xhr = null;
	}
  }

  if (xhr != null)
  {
	  var url = 'captcha/verify.php?captchastring='+theForm.validation_image.value;
	  alert(url);
	  xhr.open('GET', url, true);	  
	  xhr.onreadystatechange = function()
	  {
		  if (xhr.readyState == 4)
		  {
			  if (xhr.status == 200 || xhr.status == 304)
			  { 
				  returnValue = xhr.responseText;
				  if (returnValue == "false") {
	                return false; 
                  }
				  if (!validRequired(theForm.lastname,"Last name")) return false;
				  if (!validRequired(theForm.firstname,"First name")) return false;
				  if (!validRequired(theForm.company,"Company")) return false;
				  if (!validRequired(theForm.address,"Address")) return false;
				  if (!validRequired(theForm.telephone,"Telephone")) return false;
				  if (!validRequired(theForm.email,"Email")) return false;
				  return true;
			  }
			  else
			  {
				  returnValue = "false";
				  return false;
			  }
		  }
	  };

      xhr.send(null);
  }
}