openning a new, smaller window command

I have been looking for either an applet, Java script or HTML command that will create a new smaller window that will open up from "inside" my sites when commanded to from the main page. I need it to be able to hold and run things like a midi console or navigation buttons or site map for example, so the visitor can call it up from the task bar without going back or forth inside the main site. Any suggestions or solutions would be greatly appreciated. Thanks again for the great site and service! PS: I need something that will work in both IE and Netscape Browsers. The script that was given in reply to my original question doesn't work in IE. Thanks again!