jQuery Grid Plugin - jqGrid

Hi,

I've used the 3.5.3 treegrid withJSON data, and works fine.  The grid has around 200 rows and each can be expanded.  I expand around 10 to 30 rows, and it works just fine with Firefox but occasionally I get “Out of memory in line 185″ error with IE8 and IE7.  I've installed the IE js memory leak detector and found that the OOM issue occurs at line 60 of grid.base.js inside the parse function.  Can this be fixed?  And just wondering what this eval is doing.

Line 60: return  eval('('+js+')');

Here is my call to create the treegrid:

   $("#treegrid2").GridUnload();
   $("#treegrid2").jqGrid({
        treeGrid: true,
        treeGridModel : 'adjacency',
        ExpandColumn : 'Name',
        url: 'jsp/getTreeGridData.jsp?reportId=9553919',
        datatype: 'json',
        mtype: 'POST',
        colNames: ["Name","Relationship Type","Type","Status","Criticality","Owned By","Managed By","Support Group"],
        colModel: [{"name":"NODEID","hidden":true,"key":true,"width":150,"sortable":false,"resizable":false},{"name":"Name","width":400,"sortable":false,"resizable":true},{"name":"RELATIONSHIPTYPE","width":150,"sortable":false,"resizable":true},{"name":"Type","width":100,"sortable":false,"resizable":true},{"name":"Status","width":100,"sortable":false,"resizable":true},{"name":"Criticality","width":100,"sortable":false,"resizable":true},{"name":"OwnedBy","width":100,"sortable":false,"resizable":true},{"name":"ManagedBy","width":100,"sortable":false,"resizable":true},{"name":"SupportGroup","width":100,"sortable":false,"resizable":true}],
        width: docWidth,
        height: 'auto',
        rowNum: 2000,
        pager : jQuery("#ptreegrid2"),
        imgpath: 'themes/redmond/images'
    });

Thanks,
Callsitus