Menu writer does not have the option to add the target attribute in the wizard.
You will need to manually add the target attribute to the link after the menu is created.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.