open popup window on gridview button field

EmptyDataText="There are no data records in database to display." OnRowCommand="GridView1_RowCommand" OnRowDeleting="GridView1_RowDeleting" AllowPaging="True" CellSpacing="1" HorizontalAlign="Center" OnRowDataBound="GridView1_RowDataBound" Width="100%">

<%--

--%>

OnClientClick="return confirm('Are you sure you want to delete this event?');"

Text="Delete">

 

 

 

 

there is a  one ButtonField- Album no-Photo No which is created dynamically... this column has No of albums and total no of images. 

Now I want to open popup window on click of Album no-Photo No

 

 

Plz help me