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combo default value on page load

Hello,
I have a problem with the dhtmlxCombo, I'm a beginner.

I load the combo with a XML, for example :
<?xml version="1.0" encoding="iso-8859-1" ?>
<complete>
    <option value="10">10</option>
    <option value="20">20</option>
    <option value="50">50</option>
    <option value="100">100</option>
</complete>

I load it in my page with this command :
var f=new dhtmlXCombo("combo_page2","alfa2",40);
f.loadXML("data.xml");

I would to set a default value when my page load for the first time but it depend of a php variable.

I try this for test (without my php variable) :
f.selectOption(1);

But this is not ok

I succed it when before this command I write an alert, for example:
alert('ok');

Do you have a solution for me ?

Thank you

Ok, it works.
Thank you.