how can i select the radio button randomly in truclient?

Hi

i want to select the radio button randomly below are the xpath and javascript values

Id Method: XPath

Xpath:   //input[@type="radio" and ="seatPref" and @value="Window"]

and

/html/body/blockquote/form/table/tbody/tr[5]/td[1]/label[2]/input

Id Method: JavaScript

JavaScript: evalXPath("//div[@id=\"radioContentWrapper\" and =\"seatPref\" and @value=\"Window"]");