Option can't hide in IE6

Option can't hide in IE6

Dear all
I have a select element as below
<select id="sel">
  <option id="a">A</option>
  <option id="b">B</option>
  <option id="c">C</option>
</select>


I want to hide option A in some case and then show option A in the other case, so the code snippet as below
// in some case
$("option#a").hide();


The hide function works right in Firefox , but it can't work in IE6.
Are there any other solution that I can hide option and show it in later for IE6 browser?

Tks!