I have seen some stuff around about "return false" but don't know if this is what i am looking for.
Also i would prefer to write the script in the head rather than the actual anchor.
Any help will be good, thanks.
Why dont you just wrap the link in <noscript> tags like below:
<a href="YOURJS CALL"><noscript><a href="pop/competition.html" target="_blank"></noscript>CLICK HERE!<noscript></a></noscript></a>
Hope it helps!