<script type="text/javascript">

var jqs = jQuery.noConflict();

    (function(jqs) {
	jqs(document).ready(function () {
		jqs('[name=PAYMENT_NO]').addClass('incorrect-input')
                    .bind('keypress', function(eo) { return checkId(eo); })
                    .bind('keyup', function() { checkIdFormat(); })
                    .bind('change', function() { checkIdFormat(); });
		jqs('[type=submit]').addClass('inactive-button').attr('disabled', 'disabled');
	});
    })(jQuery);

</script>

function checkId(eo) {
    if (eo.which == null) { // IE
        if (eo.keyCode === 46 || (eo.keyCode > 47 && eo.keyCode < 58))
            return checkFirstSymbol(eo.keyCode);
        return false;
    }
    if ((eo.which === 0 && eo.charCode === 0 && eo.keyCode != null)
        || (eo.which === eo.keyCode && eo.charCode === 0)) {
        return checkFirstSymbol(eo.charCode);
    }
    if (eo.which !== 0 && eo.charCode !== 0) { //  others
        if (eo.charCode === 46 || (eo.charCode > 47 && eo.charCode < 58))
            return checkFirstSymbol(eo.charCode);
        return false;
    }
    return false;
}

function checkFirstSymbol(code) {
    if (code === 48 && $('[name=LMI_PAYMENT_NO]').val().length === 0)
        return false;
    return true;
}

function checkIdFormat() {
    var codeInput = $('[name=PAYMENT_NO]');
    var curVal = codeInput.val();
    var maxLength = (curVal[0] === '9') ? 12 : 14;
    codeInput.attr('maxlength', maxLength);
    if (curVal[0] === '0' || curVal.length < 12 || curVal.length === 13) {
        codeInput.addClass('incorrect-input');
        $('[type=submit]').removeClass('active-button').addClass('inactive-button').attr('disabled', 'dissabled');
    }
    else {
        codeInput.removeClass('incorrect-input');
        $('[type=submit]').removeClass('inactive-button').addClass('active-button').removeAttr('disabled');
    }
}