The target="" attribute always is misused because browsers are still reacting to it incorrectly. Sites do not control how links are opened on a web page. The links are set by the users' browsers' settings for Tabs. Or, they can right click any link and select to open in a new window or tab from the popup Context Menu.
Avoid forcing to open in a new window: http://www.webnauts.net/new-window.html
Force links to open in new window: http://www.knowlegezone.com/pages/document.aspx?item=9
If you want a correct way, which is not aways reliable depending on JS being enabled in the browser, use:
Open new window:
onclick="window.open (this.href, ''); return false"