// JavaScript Document
// Copyright © 2001 by Apple Computer, Inc., All Rights Reserved.
//
// You may incorporate this Apple sample code into your own code
// without restriction. This Apple sample code has been provided "AS IS"
// and the responsibility for its operation is yours. You may redistribute
// this code, but you are not permitted to redistribute it as
// "Apple sample code" after having made changes.

function checkForm(theForm) {
    var why = "";
    why += checkUsername(theForm.uname.value);
    why += checkEmail(theForm.email.value);
    why += isEmpty(theForm.comment.value);
    if (why != "") {
       alert(why);
       return false;
    }
	if(document.getElementById("hd")) theForm.headline.value=document.getElementById("hd").innerHTML;
return true;
}

// email

function checkEmail(strng) {
	var error="";
	if (strng == "") {
	   error = "You didn't enter an email address.\n";
	}

    var emailFilter=/^.+@.+\..{2,3}$/;
    if (!(emailFilter.test(strng))) { 
       error = "Please enter a valid email address.\n";
    }
    else {
//test email for illegal characters
       var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/
         if (strng.match(illegalChars)) {
          error = "The email address contains illegal characters.\n";
       }
    }
	return error;    
}

// username - 4-10 chars, uc, lc, and underscore only.

function checkUsername (strng) {
var error = "";
if (strng == "") {
   error = "You didn't enter your name.\n";
}


    //var illegalChars = /\W/; // allow letters, numbers, and underscores
    if ((strng.length < 2) || (strng.length > 30)) {
       error = "The name is the wrong length.\n";
    }
    //else if (illegalChars.test(strng)) {
    //error = "The name contains illegal characters.\n";
    //} 
return error;
}       


// non-empty textbox

function isEmpty(strng) {
var error = "";
  if (strng.length == 0) {
     error = "The mandatory text area has not been filled in.\n"
  }
return error;	  
}

// was textbox altered

function isDifferent(strng) {
var error = ""; 
  if (strng != "Can\'t touch this!") {
     error = "You altered the inviolate text area.\n";
  }
return error;
}