default Radio button select ?

default Radio button select ?

Hi,
I would like to select by default first radio button from several radio buttons using jquery.

Please correct my below code.
  1. <input type="radio"  name="enteritemradio"   id= "enteritemradio"   value="EI">Enter Item Numbers
  2. <input type="radio"  name="enteritemradio"   id= "enteritemradio"   value="UI">Upload Item Numbers

  4. How to select first radio button by default.

  6. I have tried
  7.  $('input:radio[name=enteritemradio]').val('EI').attr('checked',true);    : this is not working.