var forms = ['feedback', 'bugreport', 'whereto', 'media'];
var currentform = 'feedback';
function switchForm(drop) {
	var sel = drop.value;
	currentform = sel;
	
	for(i = 0; i < forms.length; i++) {
		var pane = forms[i];
	
		if(sel == pane) {
			pe = new PeriodicalExecuter(function(pe) {
			  $(sel).setStyle({'display': 'block', 'opacity': 0});
			  $(sel).fade({ duration: 1.0, from: 0, to: 1 });
			  pe.stop();
			}.bind(sel), 0.31);

		} else {
			$(pane).fade({ duration: 0.3, from: 1, to: 0 });
			//$(pane).setStyle({'display': 'none'});
		}
	}
}



// ----------------------------------------------------------------------
// 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

// --------------------------------------------
//                  trim
// Trim leading/trailing whitespace off string
// --------------------------------------------

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


// --------------------------------------------
//                  setfocus
// 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
             msgtype, // class to give element ("warn" or "error")
             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;
  var elem = document.getElementById(fld);
  if (!emptyString.test(message)) 
    elem.firstChild.nodeValue = message;

  //elem.firstChild.nodeValue = dispmessage;  
  
  elem.className = msgtype;   // set the CSS class to adjust appearance of message
}

// --------------------------------------------
//            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, "error", "");  
      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 element to receive info/error msg
{
  var stat = commonCheck (valfield, infofield, true);
  if (stat != proceed) return stat;

  msg (infofield, "warn", "");  
  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, "error", "");
    //msg (infofield, "error", "ERROR: not a valid e-mail address");
    setfocus(valfield);
    return false;
  }

  var email2 = /^[A-Za-z][\w.-]+@\w[\w.-]+\.[\w.-]*[A-Za-z][A-Za-z]$/  ;
  if (!email2.test(tfld)) 
    msg (infofield, "warn", "");
  else
    msg (infofield, "", "");
  return true;
}


// Only script specific to this form goes here.
// General-purpose routines are in a separate file.
  function validateOnSubmit() {
    var elem;
    var errs=0;
    // execute all element validations in reverse order, so focus gets
    // set to the first one in error.
    switch (currentform) {
      case "feedback":
        if (document.forms[currentform].product.selectedIndex < 2) { msg("f_inf_product","error","Please choose  a product"); errs += 1;} else msg("f_inf_product","",String.fromCharCode(nbsp));
        if (!validatePresent(document.forms[currentform].feedback, "f_inf_feedback"))        errs += 1; 
        if (!validatePresent(document.forms[currentform].subject, "f_inf_subject"))        errs += 1; 
        if (!validateEmail  (document.forms[currentform].email, "f_inf_email", true)) errs += 1; 
        if (!validatePresent(document.forms[currentform].name, "f_inf_name"))        errs += 1;
        break;
      case "bugreport":
        if (!validatePresent(document.forms[currentform].feedback, "b_inf_feedback"))        errs += 1; 
        if (!validatePresent(document.forms[currentform].subject, "b_inf_subject"))        errs += 1; 
        if (!validateEmail  (document.forms[currentform].email, "b_inf_email", true)) errs += 1; 
        if (!validatePresent(document.forms[currentform].name, "b_inf_name"))        errs += 1;
        break;
      case "whereto":
        if (!validatePresent(document.forms[currentform].category, "inf_category"))        errs += 1;
    }
    if (errs>1)  alert('There are fields which need correction before sending');
    if (errs==1) alert('There is a field which needs correction before sending');
    return (errs==0);
  };