Search for this line and add a comma after it:
Code:
{type: 'button', name: 'color', insert: 'color', dropdown: true, color_select: true, image: 'color.gif', draw_option: this.drawColorOption, options: this.colors}
Make a new line and paste this:
Code:
{type: 'button', name: 'custom', insert: 'custom', image: 'custom.png', title: 'Custom'}
Explanation:
- Name: Name of your button
- Insert: MyCode
- Image: The image which will be shown on your button
- Title: Well, the title of your button
If you want to add an image to your button, go to jscripts/editor_themes/YOUREDITOR/images/ and upload an image which is called "custom.png". (Name it like you named it in the above line)