Open two windows with onclientclick

I'm using the code below to open a new stand-alone window using onclientclick.  The code works fine as is, but now I want to have the button click open two stand-alone windows, each with different content.  In case you're wondering, this will allow the user to view a list of available booths while having a .pdf map window also open to view the booth locations.
Does someone know if onclientclick can be configured to open two windows?
<tr> <td style="text-align:right;">Booth Location Preference:</td> <td colspan="2"><asp:TextBox ID="txtBoothPref" runat="server"></asp:TextBox></td> <td colspan="3"><asp:Button ID="Button2" runat="server" Text="View Available Booths" onclientclick="window.open('BoothViewer.aspx', '_blank', 'status=yes,scrollbars=yes,resizable=yes,width=800,height=550');return false;" /></td> </tr> ...