jQuery UI dialog button text as a variable

This won’t work because of the way jQuery handles the button name (can be with or without quotes)

This will work:

var button_name="Test";
var dialog_buttons = {}; 
dialog_buttons[button_name] = function(){ closeInstanceForm(Function); }
dialog_buttons['Cancel'] = function(){ $(this).dialog('close'); }   
$('#instanceDialog').dialog({ buttons: dialog_buttons });