Javascript variable into HTML link

I need to output a javascript value for screen.width and screen.height into a simple html link.

e.g.

<a href="http://mysite/myfolder/?keepThis=true&amp;TB_iframe=true&amp;height=[B]HELP[/B]&amp;width=[B]HELP[/B]" class="smoothbox" title="mypage">mypage</a>

Code (markup):

Is there a way to directly apply the value where I hightlighted "HELP", or is there a different method needed?

Thanks in advance for your advice.

 

I've just managed to tinker with it a bit further and got it working

here is my code

document.write('<a href="http://mysite/myfolder/?keepThis=true&amp;TB_iframe=true&amp;height='+ screen.height +'&amp;width='+ screen.width +'" class="smoothbox" title="mypage">mypage</a>');

Code (markup):

Took me a while to do this as I'm not a JavaScript programmer