can't select item in combo box

Hi all,



I found that there is a change in this combo box

It has a option group named "Active" and "Inactive". The structure of combo box as following. 

<select id="cboMarket" onchange="javascript&colon;getSubmarkets();" name="cboMarket">



<optgroup label="Active">

<option value=""></option>

</optgroup>






<option value="325">511</option>




<option value="258">Abilene</option>

<option value="1">Albany</option>






<optgroup label="Inactive">





<option value="101">!Miami - MVN</option>




<option value="45">* Daytona Beach</option>

</optgroup>






This is the reason the value isn't selected correctly on webpage. And we have the wrong result as following

w2["Cell"](2, 1)["Select"]("cboMarket")["ClickItem"]("511") //no selected value on web page

w2["Cell"](2, 1)["Select"]("cboMarket")["ClickItem"]("Abilene") //511 is selected on web page

w2["Cell"](2, 1)["Select"]("cboMarket")["ClickItem"]("Albany")//Abilene on web page



Please help me how to select a correct automatically on web page