Set rich text field to

I have a Nintex workflow that sets a rich text field to the following: 

 <a href="http://connect.nintex.com/forums/AddPost.aspx?ForumID=190#" onclick="window.frameElement.commonModalDialogClose(1 /*OK*/,'testing'); return false;"> Select </a>

 I used a build string to set a variable then set the field to that variable.  When I click on the link it doesn't appear that it's recognizing the onclick piece.

What needs to be the nintex syntax for a build string to denote href="http://connect.nintex.com/forums/AddPost.aspx?ForumID=190#" and onclick="..." 

Thanks for any insights you may have,

Dwight