_hblink ?

<script language="javascript" type="text/javascript"> function _hbLink
(a,b) { return false; } </script>

<a href="/signup" onclick="_hbLink('SignUp,'UtilityLink');">Sign Up</
a>

I got this code from YouTube, does anyone know the purpose of _hbLink
function? I searched everywhere and couldn't find any information
about _hbLink. I'm new to javascript so any help is appreciated.

Thank you

.