jQuery Grid Plugin - jqGrid

Sorry my English is not good.  Maybe somebody else had the same problem before, but I cannot find it in this forum as my reading speed is as slow as a snail.

Recently, I use jqgrid in my project. The jqgrid version is  3.8.1, and the jquery version is 1.4.4。I use Json to format the data，and i use Ajax to load the data. The browsers I used are firefox 3.6.13 and IE8.

The problem is, normally, the jqgrid shows a great performance. Everything works fine. The data shows like this:

Index  name memo

1          lily       test

2          lily2     test2

But, if I add a single quote to lily's memo,  the grid shows like this:

Index  name memo

In other words, no data can be seen as long as it contains single quote , only the table head left.

I tried to process json special charactors before put the data to jqgrid like this:

public static String jsonSpecialCharacters(String s) {
        if (s == null || s.length() <= 0) {
            return "";
        }
        String value = s.replaceAll("\", "\\\");
        value = value.replaceAll("\'", "\\'");
        value = value.replaceAll(""", "\"");
        return value;

}

It doesn't works.

It is not a good idea that to simply discard single quotes. 

So, how to deal with it? What can I do to show the single quotes in my grid ? Or is there anything I should do but I have ingored in my project?

Thanks a lot!