// ----------------------------------------------------------------------
// Javascript form validation routines.
// Author: Stephen Poley
//
// Simple routines to quickly pick up obvious typos.
// All validation routines return true if executed by an older browser:
// in this case validation must be left to the server.
//
// Update Jun 2005: discovered that reason IE wasn't setting focus was
// due to an IE timing bug. Added 0.1 sec delay to fix.
//
// Update Oct 2005: minor tidy-up: unused parameter removed
//
// Update Jun 2006: minor improvements to variable names and layout
// ----------------------------------------------------------------------

var nbsp = 160;		// non-breaking space char
var node_text = 3;	// DOM text node-type
var emptyString = /^\s*$/ ;
var global_valfield;	// retain valfield for timer thread

function trim(str)
{
  return str.replace(/^\s+|\s+$/g, '');
}


// Delayed focus setting to get around IE bug
function setFocusDelayed()
{
  global_valfield.focus();
}

function setfocus(valfield)
{
  // save valfield in global variable so value retained when routine exits
  global_valfield = valfield;
  setTimeout( 'setFocusDelayed()', 100 );
}


// msg
//
// Display warn/error message in HTML element.
// commonCheck routine must have previously been called
function msg(fld,     // id of element to display message in
             message) // string to display
{
  // setting an empty string can give problems if later set to a 
  // non-empty string, so ensure a space present. (For Mozilla and Opera one could 
  // simply use a space, but IE demands something more, like a non-breaking space.)
  var dispmessage;
  if (emptyString.test(message)) 
    dispmessage = String.fromCharCode(nbsp);    
  else  
    dispmessage = message;

  var elem = document.getElementById(fld);
  elem.firstChild.nodeValue = dispmessage;  
}

// commonCheck
//
// Common code for all validation routines to:
// (a) check for older / less-equipped browsers
// (b) check if empty fields are required
// Returns true (validation passed), 
//         false (validation failed) or 
//         proceed (don't know yet)
var proceed = 2;  

function commonCheck    (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required)   // true if required
{
  if (!document.getElementById) 
    return true;  // not available on this browser - leave validation to the server
  var elem = document.getElementById(infofield);
  if (!elem.firstChild) return true;  // not available on this browser 
  if (elem.firstChild.nodeType != node_text) return true;  // infofield is wrong type of node  

  if (emptyString.test(valfield.value)) {
    if (required) {
      msg (infofield, "required");  
      // setfocus(valfield);
      return false;
    }
    else {
      msg (infofield, "");   // OK
      return true;  
    }
  }
  return proceed;
}

// validatePresent
//
// Validate if something has been entered
// Returns true if so 
function validatePresent(valfield,  // element to be validated
                         infofield) // id of submit button to enable/disable
{
  var stat = commonCheck (valfield, infofield, true);
  if (stat != proceed) return stat;

  msg (infofield, "");  
  return true;
}

// validateEmail
//
// Validate if e-mail address
// Returns true if so (and also if could not be executed because of old browser)
function validateEmail  (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required)   // true if required
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;

  var tfld = trim(valfield.value);  // value of field with whitespace trimmed off
  var email = /^[^@]+@[^@.]+\.[^@]*\w\w$/  ;
  if (!email.test(tfld)) {
    msg (infofield, "not a valid e-mail address");
    // setfocus(valfield);
    return false;
  } else {
  	msg(infofield, "");
  }
  return true;
}




////// THE PAGE-SPECIFIC BIT...
function validateForm(form) {
  
    var errs=0;
    if (!validateEmail  (document.forms.contactus.email, 'inf_email', true)) errs += 1; 
    if (!validatePresent(document.forms.contactus.name,  'inf_name'))        errs += 1; 

    if (errs>=1) {
    	document.forms.contactus.submit.disabled="true";
    	document.forms.contactus.submit.className="submit submit-disabled";
    } else {
    	document.forms.contactus.submit.removeAttribute('disabled');
    	document.forms.contactus.submit.className="submit";
    }

    return (errs >= 1);
}
function submit(form) {
	if (validateForm()) {
		form.submit();
	}
}