On Stack Overflow, you don't see an address, because it isn't a link (i.e. it isn't an anchor). It is a span, image or other element, with an onclick event handler.
This is the only way to guarantee no status-bar text in all browsers as the old-school JavaScript method of setting window.status = ""; has no effect in most browsers these days.
So, for example...
[Html]
<img id="clickme" src="myimage.png" alt="My Image" title="Vote">
[JavaScript (jQuery)]
$("#clickme").click(function() { alert("You clicked me"); });
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