// Array to hold error messages

    var errors = new Array();

    

    // Function to add an error message to the array

    function addError(msg)

    {

        if ( (msg != null) && (msg.length > 0) )

            errors.push(msg);

    }



    // Function to validate whether all form fields are filled

    // Parameter notRequired contains an array of fieldnames not to be checked

    // Parameter identifier contains initial characters of the fields to be checked

    // Returns the names of the fields that failed the verification, separated by commas.

    function validate(myForm, notRequired, identifier)

    {               

        var strCompulsory = '';          

                

        for (var i=0;i< myForm.elements.length;i++)

        { // for all of the elements on the form..

            // except those excluded

            var exclude = false;

            if (notRequired != null)

              for (var j=0; j < notRequired.length; j++)

                if (myForm.elements[i].name == notRequired[j])

                    exclude = true;

                    

            if ( ((myForm.elements[i].name.indexOf(identifier) == 0) || (identifier == null)) &&

                 (!exclude) ) 

            { // if the element's name starts with the identifier or no identifier is required..

                if (myForm.elements[i].type == 'select-one' || myForm.elements[i].type == 'select-multiple') 

                {

                    // if it's a list element(for Nav)..

                    if (!myForm.elements[i].options[myForm.elements[i].selectedIndex].value)

                    {

                        // and if the element is empty give a warning

                        strCompulsory = strCompulsory + ' ' + myForm.elements[i].name + ',';

                    }

                }

                else

                    if (!myForm.elements[i].value) 

                    {

                        strCompulsory = strCompulsory + ' ' + myForm.elements[i].name + ',';

                    }               

            } 

        }

        return strCompulsory;

    } 



    // Function to assess whether a specified string has a predefined HTTP URL format.

    // Returns true ou false.    

    function isSite(siteURL) 

    {   

        var siteok=/^(http:\/\/)?[A-Za-z0-9-_]+\.([a-zA-Z]{2,3}|[0-9]{1,3})[A-Za-z0-9-_%&\?\/.=]+$/;        

        return checkRegEx(siteURL, siteok);

    }

    

    // Function to assess whether a specified string has a predefined e-mail format.

    // Returns true ou false.

    function isEmail(mailAddress) 

    {   

        var mailok=/^.+\@(\[?)[a-zA-Z0-9\-\.]+\.([a-zA-Z]{2,3}|[0-9]{1,3})(\]?)$/;       

        return checkRegEx(mailAddress, mailok);

    }

    

    // Function to assess whether a specified string matches a given regular expression

    // Returns true ou false.

    function checkRegEx(str, regextrue) 

    {      

        var reg = regextrue; // valid

        if (reg.test(str)) // if syntax is valid

            return true;

        else return false; // if syntax is not valid

    }



    // Function to generate a password, all capitals, with a specific size, and a specific prefix

    function genPassword(size, prefix)

    {

           var chars = new Array('A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','X','Z','0','1','2','3','4','5','6','7','8','9');

                         

           var passSize = size;

           var pass = prefix;

           for (var i = 0; i < passSize; i++)

           {

                var pos = Math.floor(Math.random()* chars.length);

                pass = pass + chars[pos];

           }

           return pass;

    }