Mark,
The issue isn't actually a z-index problem. The Like, and other social widgets, function in an iFrame. If the widget needs to expand (like the Like and Comment widget), any of the divs containing that widget have an overflow:hidden set, and the widget is going to go beyond that containing div, you'll see that issue.
In your case, it looks like if you change the following style, your problem should be fixed:
msneadfamily.com/templates/callie_rush/css/template_default.css, line 65
#s5_columns_wrap {
overflow: hidden;
}
Either remove or comment out the overflow:hidden line. Or, change it's value from hidden to visible.
Home,
If you're still having this issue, please post from the account you subscribed from, and we'll be glad to help you work out the style change you need as well.
Thanks,
Alex