jQuery Grid Plugin - jqGrid

My grid uses true scrolling {scroll:1} and zebra effect {altRows:1, altClass=”alternateRow”}. The second page always starts with an even row, that is not correct.
(complete grid configuration: http://www.trirand.com/blog/?p.....rs/#p14054) 

Example:
Page 1 consists of 9 records. The last row will be an even row, it doesn't have the class “alternateRow”.
When true scrolling is on, the second page starts with an even row. This row doesn't also have the class “alternateRow”.
This results in two even rows next to each other.

I think the code j=0 is incorrect on line 485 in grid.base.js.
This is used to determine wether the row is even or odd in cn1 = j%2 == 1 ? cn : '';
I don't know how to access the previous row added to determine if the row should be an even or an odd one.

Do you know how to fix this?