Dialog plugin doesn't work when jQuery UI 1.6 and 1.5 are loaded on the same page.

jQuery UI 1.5 and 1.6rc5 were loaded by the same page, Dialog stopped working. Details:

With this HTML markup:

<div title="Dialogo hola" id="dialogo">Hola

</div>

And this js code (it doesn't matter where do I place it, it throws the

same error):

$('#dialogo').dialog();

I get:

$[namespace][name] is not a constructor

jquery-ui-personalized-1.6rc5.js

Line 272

Line 272 is:

$.data(this, name, new $[namespace][name](this, options)));

The solution was not to include both versions. It would be nice to have an automatic check.