Required library edition:
Required library file: dhtmlxtoolbar.js

adds a button to webbar

• id - id of a button
• pos - position of a button
• text - text for a button (null for no text)
• imgEnabled - image for enabled state (null for no image)
• imgDisabled - image for desabled state (null for no image)

    toolbar.addButton(id, pos, text, imgEnabled, imgDisabled);