var exception = new Image;
exception.src = "/images/en/exception.gif";
var spacer = new Image;
spacer.src = "/images/en/spacer.gif";

var whitespace = " \t\n\r";

// validate (formName,fields,errMsg)
// formName the name of the form containing fields
// fields an array containing names of form fields
// errMsg a language specifuc error message
// which cannot be empty
// turns on an exception image at any empty fields
// submits the form if none of the mandatory fields are empty
function validate(formName,fields,errMsg){
	var arrLen = fields.length;
	var i,elemName,elemLength,theForm,tempField;

	theForm=eval("document."+formName);
	elemLength=eval("document."+formName+".elements.length");
	//alert("elemLength is "+elemLength);

	// turn off any exception graphics
	elemName="";
	for(i=0;i<elemLength;i++){
		elemName+=theForm.elements[i].name+"\n";
		tempField=eval("document."+formName+"."+theForm.elements[i].name+"Exception");
		if (tempField){
			//alert("setting "+theForm.elements[i].name+" to space");
			tempField.src=spacer.src;
		}
	}	

	var validationOk=true;
	for (i=0;i<arrLen;i++){
		if (fields[i]==""){
			continue;
		}
		formField = eval("document."+formName+"."+fields[i]);
		formValue = formField.value;
        //alert (formField.name+" type is "+formField.type);
		// if the field is a select then return false if the selectedIndex is 0
		if (formField.type == "select-one")	{
			if (formField.selectedIndex == 0){
				eval("document."+fields[i]+"Exception.src=exception.src");
				//alert("formField is "+formField.name);
				validationOk=false;
			}
		}
		else if (formField.type == "text" || formField.type == "hidden" || formField.type == "password"){
			if (isWhitespace(formValue)){
				eval("document."+fields[i]+"Exception.src=exception.src");
				validationOk=false;
			}
		}
        // the other field type is checkbox
        else {
            var checked=false;
            for (j=0;j<formField.length;j++) {
                if (formField[j].checked == true) {
                    checked=true;
                    break;
                }
            }
            // if at least one box is checked this is ok
            // otherwise fail the validation
            //alert("checked is "+checked);
            if (!checked) {
                eval("document."+fields[i]+"Exception.src=exception.src");
                validationOk=false;
            }

        }

	}
	if (!validationOk){
		alert(errMsg);
		return false;
	}
	else {
		//eval("document."+formName+".submit()");
		return true;
	}
}

// Returns true if string s is empty or
// whitespace characters only.
function isWhitespace (s)

{   var i;

	// Is s empty?
	if (isEmpty(s)) return true;

	// Search through string's characters one by one
	// until we find a non-whitespace character.
	// When we do, return false; if we don't, return true.

	for (i = 0; i < s.length; i++)
	{
		// Check that current character isn't whitespace.
		var c = s.charAt(i);

		if (whitespace.indexOf(c) == -1) return false;
	}

	// All characters are whitespace.
	return true;
}

// Check whether string s is empty.
function isEmpty(s)	{
	return ((s == null) || (s.length == 0))
}

function getkey(e)
{
 
if (window.event)
   return window.event.keyCode;
else if (e)
   return e.which;
else
   return null;
}

function goodchars(e, goods)
{
var key, keychar;
key = getkey(e);
if (key == null) return true;
 
// get character
keychar = String.fromCharCode(key);
//alert(keychar);
keychar = keychar.toLowerCase();
goods = goods.toLowerCase();

// check goodkeys
if (goods.indexOf(keychar) != -1)
	return true;

// control keys
if ( key==null || key==0 || key==8 || key==9 || key==13 || key==27 )
   return true;

// else return false
return false;
}

function emailCheck (emailStr, emailMsg){
	return emailChecker(emailStr, emailMsg,"emailException");
}
function emailChecker (emailStr, emailMsg,exception) {
/* The following pattern is used to check if the entered e-mail address
   fits the user@domain format.  It also is used to separate the username
   from the domain. */
var emailPat=/^(.+)@(.+)$/
/* The following string represents the pattern for matching all special
   characters.  We don't want to allow special characters in the address. 
   These characters include ( ) < > @ , ; : \ " . [ ]    */
var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
/* The following string represents the range of characters allowed in a 
   username or domainname.  It really states which chars aren't allowed. */
var validChars="\[^\\s" + specialChars + "\]"
/* The following pattern applies if the "user" is a quoted string (in
   which case, there are no rules about which characters are allowed
   and which aren't; anything goes).  E.g. "jiminy cricket"@disney.com
   is a legal e-mail address. */
var quotedUser="(\"[^\"]*\")"
/* The following pattern applies for domains that are IP addresses,
   rather than symbolic names.  E.g. joe@[123.124.233.4] is a legal
   e-mail address. NOTE: The square brackets are required. */
var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
/* The following string represents an atom (basically a series of
   non-special characters.) */
var atom=validChars + '+'
/* The following string represents one word in the typical username.
   For example, in john.doe@somewhere.com, john and doe are words.
   Basically, a word is either an atom or quoted string. */
var word="(" + atom + "|" + quotedUser + ")"
// The following pattern describes the structure of the user
var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
/* The following pattern describes the structure of a normal symbolic
   domain, as opposed to ipDomainPat, shown above. */
var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")

var exceptionField=eval("document.expressBooking."+exception);
//alert("exceptionField.name is "+exceptionField.name);
var exception = new Image;
exception.src = "/images/en/exception.gif";
exceptionField.src=exception.src;


exceptionField.src=spacer.src;

/* Finally, let's start trying to figure out if the supplied address is
   valid. */
/* If no email passed do not attempt to validate*/
if (emailStr == "")
{
	return true;
}

/* Begin with the coarse pattern to simply break up user@domain into
   different pieces that are easy to analyze. */
var matchArray=emailStr.match(emailPat)
if (matchArray==null) {
  /* Too many/few @'s or something; basically, this address doesn't
     even fit the general mould of a valid e-mail address. */
	alert(emailMsg)
	exceptionField.src=exception.src;
	return false
}
var user=matchArray[1]
var domain=matchArray[2]

// See if "user" is valid 
if (user.match(userPat)==null) {
    // user is not valid
	alert(emailMsg)
	exceptionField.src=exception.src;

    return false
}

/* if the e-mail address is at an IP address (as opposed to a symbolic
   host name) make sure the IP address is valid. */
var IPArray=domain.match(ipDomainPat)
if (IPArray!=null) {
    // this is an IP address
	  for (var i=1;i<=4;i++) {
	    if (IPArray[i]>255) {
			alert(emailMsg)
			exceptionField.src=exception.src;
		return false
	    }
    }
    return true
}

// Domain is symbolic name
var domainArray=domain.match(domainPat)
if (domainArray==null) {
	alert(emailMsg)
	exceptionField.src=exception.src;
    return false
}

/* domain name seems valid, but now make sure that it ends in a
   three-letter word (like com, edu, gov) or a two-letter word,
   representing country (uk, nl), and that there's a hostname preceding 
   the domain or country. */

/* Now we need to break up the domain to get a count of how many atoms
   it consists of. */
var atomPat=new RegExp(atom,"g")
var domArr=domain.match(atomPat)
var len=domArr.length
if (domArr[domArr.length-1].length<2 || 
    domArr[domArr.length-1].length>3) {
   // the address must end in a two letter or three letter word.
	alert(emailMsg)
	exceptionField.src=exception.src;
   return false
}

// Make sure there's a host name preceding the domain.
if (len<2) {
	alert(emailMsg)
	exceptionField.src=exception.src;
   return false
}

// If we've gotten this far, everything's valid!
return true;
}