jQuery UI dialog extension to set the message body of the dialog similar to the way dialog title is set.

jqueryui-dialog-message.js

var __setOption = $.ui.dialog.prototype._setOption;
$.extend($.ui.dialog.prototype, {
    _setOption : function (key, value) {
        var self = this,
            uiDialog = self.uiDialog;
        if (key === 'message') {
            self.element.html("" + (value || ' '));
        }
        __setOption.apply(self, arguments);
    }
});