First of all, I should mention I am heavily opposed to fairly recent trend of sites opening a new browser window when linking to another site. If I want to open the link in another window, I’ll open it in another window.

With my rant out of the way, sometimes it is absolutely essential that you be able to open a new browser window (i.e. enlarged images, links to other sites (when you specify the link will open a new window)), in which case the latest w3C strict specifications do have the Target attribute for the A tag. You could use a transitional language, but these are “dying” specifications, or you could implement a standards compliant “new window” link using java script.

This helpful article shows you exactly how to implement the script in your HTML pages. It is very simple to do and you can easily apply it to your existing pages. If the only thing keeping you from moving to a “Strict” W3C specification is the target attribute, then your problem is solved.