If I get you, you want your link to open the page in another tab.
You can use the target link attribute as follows:
<a href="somepage.html" target=newtab>text</a>
If you want to enter something into the browser URL field, this is a bookmarklet, , you can use this:
javascript: window.open('http://www.dystroy.org');
In most browsers, ctrl-click, a link does the same.
EDIT:
If you can only change the href attribute of a link, you can make it href as follows:
<a href="javascript:window.open('http://www.dystroy.org');" target=_blank>text</a>
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