Link not opening new window

Hey,

When I click the link to the ‘tell a friend’ or in my case ‘tell a collegue’ it does not open a new window. It takes up the whole screen in the same window….

http://designpush.co.uk/architects/

Can someone help me make it open a new window 🙂

http://ww.wp.xz.cn/extend/plugins/af-tell-a-friend/