code: function get_req () {
  		var self = this;
  		var req;
  		if (window.XMLHttpRequest) {
  			try {
  				req = new XMLHttpRequest();
  			} catch(e1) {
  				req = false;
  			}
  		} else if (window.ActiveXObject) {
  			try {
  				req = new ActiveXObject("Microsoft.XMLHTTP");
  			} catch(e2) {
  				req = false;
  			}
  		}
  		return req;
  	}
docs: utility function for XHR