[jQuery] jQuery not working - please help

[DanDaBeginner]

I have been searching on the net for 5 hours already but can't find an
answer.. PLEASE SOMEBODY HELP ME!

the firebug is giving me this error:
XML filter is applied to non-XML value (function (selector, context)
{return new (jQuery.fn.init)(selector, context);})

this was just the only jQuery code that I have:

jQuery.(document).ready(function () {
    jQuery.('#regpage h3 > a').click(function () {
        alert('hello');
        return false;
    });
})

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Thank you in advance!