Accrue.js callback example.

accrue.callback.js

$( selector ).accrue({ 
  callback: function( elem, data ){
    if ( data===0 ) {
      // ERROR FUNCTIONALITY HERE
    } else {
      // SUCCESS FUNCTIONALITY HERE
	
      // find elements inside the calculator div, and do things with them.
      elem.find( ".results:hidden" ).slideDown( 300 );
		
      // dump the calculation info to console to learn how to use it.
      console.log( data );
    }
  }
});