This works for me:
import spynner
URL = 'https://www.imleagues.com/Login.aspx'
address = "http://www.imleagues.com/School/Team/Home.aspx?Team=27d6c31187314397b00293fb0cfbc79a"
b = spynner.Browser()
b.show()
b.load(URL)
b.runjs('$("#ctl00_ContentPlaceHolder1_inUserName").val("testUser")')
b.runjs('$("#ctl00_ContentPlaceHolder1_inPassword").val("testPass")')