function  _CF_checkRentalForm(_CF_this)
    {
        //reset on submit
        _CF_error_exists = false;
        _CF_error_messages = new Array();
        _CF_error_fields = new Object();
        _CF_FirstErrorField = null;

        //form element title required check
        if( !_CF_hasValue(_CF_this['title'], "TEXT", false ) )
        {
            _CF_onError(_CF_this, "title", _CF_this['title'].value, "Please enter your name!");
            _CF_error_exists = true;
        }

        //form element email required check
        if( _CF_hasValue(_CF_this['email'], "TEXT", false ) )
        {
            //form element email 'EMAIL' validation checks
            if (!_CF_checkEmail(_CF_this['email'].value, true))
            {
                _CF_onError(_CF_this, "email", _CF_this['email'].value, "A valid Email address is required!");
                _CF_error_exists = true;
            }

        }else {
            _CF_onError(_CF_this, "email", _CF_this['email'].value, "A valid Email address is required!");
            _CF_error_exists = true;
        }

        //form element uword required check
        if( !_CF_hasValue(_CF_this['uword'], "TEXT", false ) )
        {
            _CF_onError(_CF_this, "uword", _CF_this['uword'].value, "Error in uword text.");
            _CF_error_exists = true;
        }

        //form element agree required check
        if( !_CF_hasValue(_CF_this['agree'], "CHECKBOX", false ) )
        {
            _CF_onError(_CF_this, "agree", _CF_this['agree'].value, "You must agree to our privacy policy!");
            _CF_error_exists = true;
        }


        //display error messages and return success
        if( _CF_error_exists )
        {
            if( _CF_error_messages.length > 0 )
            {
                // show alert() message
                _CF_onErrorAlert(_CF_error_messages);
                // set focus to first form error, if the field supports js focus().
                if( _CF_this[_CF_FirstErrorField].type == "text" )
                { _CF_this[_CF_FirstErrorField].focus(); }

            }
            return false;
        }else {
            // run userdefined onSubmit javascript. 
            return jcap();
            return true;
        }
    }