I have tried a number of examples here but I can get my code to actually show a popup window before deletion. The code I use can be found here: 

`echo "<td><button class='btn'><a href=\"deleteuserExecute2.php?login=" .$login. "\" onClick=\"return confirm(\'Delete this Account?\')\"; >DELETE ACCOUNT </a></button></td>";`

<http://jsfiddle.net/mpogoro/EGfcY/>