reinitialise "Share This" script on ajax page refresh.

/**
 * reinitialise "Share This" script on ajax page refresh. 
 **/
delete stLight;delete stButtons;delete stFastShareObj;delete stIsLoggedIn;delete stWidget;delete stRecentServices;
$.getScript("http://w.sharethis.com/button/buttons.js", function() {
var switchTo5x= true;
stLight.options({publisher:'dr-37136bf8-87b-54c5-da06-aef5bbe9cb52'});
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