scrollByIndex( lines )
Return type: no return value
Scrolls the contents of the arrowscrollbox by a certain number of lines. A line is a single element. Use a positive value as the lines argument to scroll forward that many lines, or a negative value to scroll backward that many lines.

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 Contributors to this page: Sheppy, ethertank, Marsf, Dria
 Last updated by: Sheppy,