<Script lang = "Java Script">

function winopen()

{

window.open (http://newpage.aspx,"mywindow","status=1");

}

The code below opens a window with toolbar and status bar.

window.open (http://new page.aspx,"mywindow","status=1,toolbar=1");

 then add the attribute in the code behind file

this.button.attributes.add("onMouseOver","winopen()");