Selected only one values
===

i have: 

    <select id="number" name="number">
    <option value=""></option>
    <option value="1">01</option>
    <option value="2" selected="selected">02</option>
    <option value="3">03</option>
    <option value="4" selected="selected">04</option>
    <option value="5">05</option>
    </select>

and next with jQuery i use for example:

    $('#number').val(1);

but this add next value - 1 and now i have:


    <select id="number" name="number">
    <option value=""></option>
    <option value="1" selected="selected">01</option>
    <option value="2" selected="selected">02</option>
    <option value="3">03</option>
    <option value="4" selected="selected">04</option>
    <option value="5">05</option>
    </select>

what i must use with:

    $('#number').val(1);

that all others value can be not selected? So i would like - if i set new val then all others values can be reset. Maybe use each for reset, but how?
I know - this should be multiselect = false, but this is not my code - i must use this this jQuery.