Jquery onkeypress bug

Hi,

i have created a function that is triggered by a keypress. It seems to work fine with every key other than tab! any idea why?

My function is attached

Thanks

$("#CustomFields_1_1").live('keyup', function (e) 

      { 
	  $("#newscompany").css('display','none');
          $("#CustomFields_2_1").css('display','block'); 
          $("#CustomFields_2_1").focus();
          event.preventDefault();
		
      });

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