How can I change link text color on OnClick if there is Window.Open

Question

I have a link that has an OnClick event defined with Window.Open - I want to do one more thing on OnClick - change the color of the visited links on the page. But If I define this.style.color=blue on the OnClick event along with Window.Open, the link no longer opens in a new window (but the color change happens). How can I achieve this visited link change color in this situation (opening the link in a new window)

Pls see http://fo.unta.in and click on any link (in IE) to see this problem.