CKEDITOR 4 Paypal Insert Plugin paypal.js

/* This is my paypal.js code */
(function()
{
    var paypalButtonData = {};

    CKEDITOR.dialog.add( 'paypalChooseButton', function( editor )
    {
        var lang = editor.lang.paypal;

        return {
            title     : CKEDITOR.env.ie ? lang.dlgTitle : lang.title,
            minWidth  : 300,
            minHeight : 250,
            contents  : [
                {
                    id: 'paypal1',
                    label: '',
                    title: '',
                    expand: false,
                    padding: 0,
                    elements: [
                        {
                            type: 'select',
                            id: 'CKpaypal-currency',
                            label: lang.labelButtontype + ' *',
                            items: [ ['Please select one:', ''],['Single Item', 'paypalCreateSingleButton'],['Multi Choice Button', 'paypalCreateMultiButton']],
                            validate: function()
                            {
                                if( this.getValue() === '' )
                                {
                                    document.getElementById( 'CKpaypal-validationMessages' ).innerHTML = lang.validatecurrency;
                                    return false;
                                };
                            },
                            commit: function()
                            {
                                paypalButtonData.buttonType = this.getValue();
                            }
                        },
                        {
                            type: 'html',
                            html: '<div id="CKpaypal-validationMessages" style="color:red;font-weight:bold;margin-top:20px;"></div>'
                        }
                    ]
                }
            ],
            onOk: function()
            {
                this.commitContent();

                console.log( paypalButtonData );
                editor.openDialog( paypalButtonData.buttonType );
                return;
            },
            onShow: function()
            {
                paypalButtonData = {};
                document.getElementById( 'CKpaypal-validationMessages' ).innerHTML = '';
                return;
            }
        };

    });

})();