Selecting combobox?

[boutinm]

I have a combobox that loads a dataset into it. When the user selects an item, I save the id into a db to reload what they picked for later use. Is there a way to search through the dataset to find the proper id, then select that item in the combobox box?

<dataset>
<cars>
<car name="" id="5">
<car name="" id="13">
<car name="" id="43">
</cars>
</dataset>