How to pop up new window with tweet button
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I have many custom tweet buttons on my page that I am dynamically generating using this line of PHP executed in a loop:

    echo "<li><a href=\"https://twitter.com/share?text=Check%20out%20{$items[$i]['name']}%20at%20completeset.us/item/{$items[$i]['item_id']}&url=&via=cmpltst\"  class=\"twitter\">T</a></li>";

This works perfectly fine, however, this executes in the same tab and navigates me away from the page it was called from. I would like to open the share dialog in a new window, but my Javascript background is limited to form validation and a few Jquery Ajax calls, so I have no idea how to go about doing this. How could I pop up the dialog in a new window?