jQuery Grid Plugin - jqGrid

Hi,

I know this is probably straight forward but I cannot figure out where or how to define the errorfunc. I have the following defined in my jqgrid definition for inline editing:

    ondblClickRow: function(id){
        if(id && id!==lastSel){
            jQuery('#grid').restoreRow(lastSel);
            lastSel=id;
        }

        jQuery('#grid').editRow(id, true, errorfunc); 
    }

I want to use the errorfunc but I canot figure out where or how to declare it.

I have read the documentation and it is not clear to me on how to use it.

Any help would be greatly appreciated.

Regards
Andrew