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MooTools Input focus, blur
by pennywise81

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    {'value', input.get('value'));
        'focus' : function()
          if (input.get('value') != '')'value', input.get('value'));
          input.set('value', '');
        'blur' : function()
          if (input.get('value') == '')
            input.set('value', input.retrieve('value'));

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