Question

I want the user to click the select box and when have selected any option redirect to index.php?id={variableId}&itemId={secondVariableId}

Like:

<select name="select">
<option value="id=1&itemId=2">One</option>
<option value="id=1&itemId=3">One</option>
<option value="id=2&itemId=1">One</option>
[...]
</select>

But, I can not imagine where to start

Answer 1

<select name="select" onchange="window.location='index.php?' + this.value;">
    <option value="default">- select -</option>
    <option value="id=1&itemId=2">One</option>
    <option value="id=1&itemId=3">One</option>
    <option value="id=2&itemId=1">One</option>
    [...]
</select>