How to open popup window when we click on Image button in Web Grid in MVC4

Please find the Web Grid Code :-


  @grid.GetHtml(tableStyle: "webgrid-table",
                        headerStyle: "webgrid",
                        footerStyle: "webgrid-footer",
                        alternatingRowStyle: "webgrid-alternating-row",
                        rowStyle: "webgrid-row-style",
                    columns:
                grid.Columns
                (

grid.Column(format: @<a onclick="Approval(@item.CId);" > <img id="imgHApprove" src="~/images/Approve.png" width="15px;" height="15px;" style="cursor:pointer;" title="click here to approve by" disabled="disabled" /></a>)
 )
                  )

To open a Popup window, Please find the Code below.

<script language="Javascript" type="text/javascript">
    function Approval(CId) {
       window.open('/HUser/Approve' + '?CId=' + CId, "WindowPopup", 'width=600px,height=450px,top=150,left=50');
    }
    </script>