How To Replace Text With Image In Custom DataGrid Edit,Delete,Cancel

<asp:EditCommandColumn HeaderText="Edit" HeaderStyle-BackColor="#efeded"


CancelText="<img src='Images/icon_cancel.gif' alt='Cancel' style='border:0px' />"


EditText="<img src='Images/icon_edit.gif' style='border:0px'  alt='Edit'/>" 


UpdateText="<img src='Images/icon_save.gif' alt='Update' style='border:0px' />">


</asp:EditCommandColumn>