jQuery Grid Plugin - jqGrid

Recently i met a problem in my project。
The problem is：
I use multiple search in my project,but it doesn’t work well in ie8.
In order to reappear the problem。
first，you can open website http://www.trirand.com/blog/jq.....qgrid.html
second,click New in version 3.7 and choose muliple search.
third,click search button in the grid.
forth,choose Name in the search dialogue,then you cann’t select begins with option.
I want to know how to solve this problem?