title: What does google.setOnLoadCallback(initialize) function exactly mean?
body: <p>While coding JavaScript and Ajax, there is no proper documentation for this function. I searched this term using <code>api src="http://www.google.com/jsapi"</code> and <code>searchControl.execute("abhilashm86");</code>.</p>
  
  <p>How is this <code>google.setOnLoadCallback(initialize)</code> called internally? Is this function just for a new search term when the user clears previous search and starts a new one? 
  How exactly does <code>google.setOnLoadCallback(initialize)</code> get trigerred?</p>