Need The Custom Ajax to be executed synchronously in logic.js

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Dear All,

Currently I'm trying to customized the widget login\LoginDialog per the requirement. I'm going to validate the username manually before the real login.

I tried to override the function _validateUsername as below,

_validateUsername: function(username) {             alert('username:' + username);             //    this.parent();             //var results = {};             if (username.indexOf(' ') > -1)                 return RightNow.Text.sprintf(RightNow.Interface.getMessage("PCT_S_MUST_NOT_CONTAIN_SPACES_MSG"), RightNow.Interface.getMessage("USERNAME_LBL"));             if (username.indexOf('"') > -1)                 return RightNow.Text.sprintf(RightNow.Interface.getMessage("PCT_S_CONTAIN_DOUBLE_QUOTES_MSG"), RightNow.Interface.getMessage("USERNAME_LBL"));             if (username.indexOf("<") > -1 || username.indexOf(">") > -1)