Make this Script Include callable from a Client Script via GlideAjax.

01var UserUtils = Class.create();
02UserUtils.prototype = Object.extendsObject(▢ ▢ ▢ ▢, {
03  getManager: function() {
04    var u = this.getParameter('sysparm_user');
05    var gr = new GlideRecord('sys_user');
06    if (gr.get(u)) return gr.getValue('manager');
07    return '';
08  },
09  type: 'UserUtils'
10});