Learn how to Open a New browser Window in Dreamweaver
Open the behaviors panel by clicking on Windows/Behaviors.
Select the text that you would like to link to the new browser window.
Click on the '+' symbol in the behaviors panel.
Click on 'Open Browser Window'
In the 'Open browser Window' pop-up-window select the URL and specify the width and the height of the window. You can also choose if you want a status bar or a scroll bar etc.
Click on OK
In the behaviors panel under the Events Column you can choose onClick if you want the browser window to open only when the link is clicked.