There's a couple of possible reasons it's not working right. First, there's a Javascript error on your page:
Uncaught TypeError: Cannot call method 'reload' of undefined
(anonymous function) www.insofti.com.br/:104
g.condition.i mootools-core.js:118
m
That's coming from this line in your RocketTheme template:
window.addEvent('load', function(){
RokSprocket.instances.mosaic.mosaic['id-100'].reload();
});
That could be preventing more Javascript execution from occurring, like our modal.
Additionally, you have 2 different versions of JQuery loading on your page. v.1.8.3 from your template and v1.9.0 from the SCLogin module. I'd try disabling the "Include JQuery" setting in the SCLogin module. If that doesn't work, and you can, disable JQuery in your template and enable it in our module.
Let us know if either of those helps, but the RokSprocket error above may be the most important to figure out and diagnose.
Thanks,
Alex