Iframe. How to load links in an iframe

I have an iframe loading in my page. Ex.: http://thissite.com.

<iframe width="400" height="300" frameborder="0 scrolling="no" marginheight="0" marginwidth="0" src="http://www.mysite.com/page.php">

Actually if I click on a link into the iframe I get the new page into the iframe itself.

I want the new page loading from http://thissite.com. and not into the iframe.

How to tdo that?

Use target="_top" on <a> link.