After passing variable to HREF tag, How to use target statement?

Here’s the code that allows me to pass a URL to an HREF tag:

<a href="javascript:location.href=EventTerms">Terms &amp; Conditions</a>

However, I need to open this URL in a new window (since the user will click this link on a registration form). I’ve tried this kind of thing, but it just opens a new blank window:

<a href="javascript:location.href=EventTerms" target="_blank">Terms &amp; Conditions</a>

What’s the correct way to do this?