how to pass the dialogue box buttons name as variable in jquery dialogue -

here want dialogue box button values 'yes','no' variable.i want pass variable butt1 buttons .

 var button ='yes'  $("#modal_confirm_yes_no").dialog({         bgiframe: true,         autoopen: false,         minheight: 200,         width: 350,         modal: true,         closeonescape: false,         draggable: false,         resizable: false,         buttons: {                 'yes': function(){                     $(this).dialog('close');                     callback(true);                 },                 'no': function(){                     $(this).dialog('close');                     callback(false);                 }             }     }); 

 var button ='yes'  $("#modal_confirm_yes_no").dialog({     bgiframe: true,     autoopen: false,     minheight: 200,     width: 350,     modal: true,     closeonescape: false,     draggable: false,     resizable: false,     buttons: [         {text: button, click: function() {             $(this).dialog('close');             callback(true);         }},         {text: 'no', click: function() {             $(this).dialog('close');             callback(false);         }}     ] });