update next elements at the same level in the DOM
<p>I have this code :</p>

<pre><code>&lt;div class="trackOn" id="line1"&gt;
    &lt;span class="trackCounter"&gt;1&lt;/span&gt;
    &lt;span class="trackTime1"&gt;
        &lt;select name="hours[]" class="trackInputDate" onChange="updateHours(this.value)" &gt;
            &lt;option value="1"&gt;1&lt;/option&gt;
            &lt;option value="2"&gt;2&lt;/option&gt;
            &lt;option value="3"&gt;3&lt;/option&gt;                
        &lt;/select&gt;
    &lt;/span&gt;
    &lt;span class="trackTime2"&gt;&lt;/span&gt;
    &lt;span class="trackTime3"&gt;&lt;/span&gt;
&lt;/div&gt;

&lt;div class="trackOn" id="line2"&gt;
    &lt;span class="trackCounter"&gt;2&lt;/span&gt;
    &lt;span class="trackTime1"&gt;
        &lt;select name="hours[]" class="trackInputDate" onChange="updateHours(this.value)" &gt;
            &lt;option value="1"&gt;1&lt;/option&gt;
            &lt;option value="2"&gt;2&lt;/option&gt;
            &lt;option value="3"&gt;3&lt;/option&gt;                
        &lt;/select&gt;
    &lt;/span&gt;
    &lt;span class="trackTime2"&gt;&lt;/span&gt;
    &lt;span class="trackTime3"&gt;&lt;/span&gt;
&lt;/div&gt;

&lt;div class="trackOn" id="line3"&gt;
    &lt;span class="trackCounter"&gt;3&lt;/span&gt;
    &lt;span class="trackTime1"&gt;
        &lt;select name="hours[]" class="trackInputDate" onChange="updateHours(this.value)" &gt;
            &lt;option value="1"&gt;1&lt;/option&gt;
            &lt;option value="2"&gt;2&lt;/option&gt;
            &lt;option value="3"&gt;3&lt;/option&gt;                
        &lt;/select&gt;
    &lt;/span&gt;
    &lt;span class="trackTime2"&gt;&lt;/span&gt;
    &lt;span class="trackTime3"&gt;&lt;/span&gt;
&lt;/div&gt;

&lt;div class="trackOn" id="line4"&gt;
    &lt;span class="trackCounter"&gt;4&lt;/span&gt;
    &lt;span class="trackTime1"&gt;
        &lt;select name="hours[]" class="trackInputDate" onChange="updateHours(this.value)" &gt;
            &lt;option value="1"&gt;1&lt;/option&gt;
            &lt;option value="2"&gt;2&lt;/option&gt;
            &lt;option value="3"&gt;3&lt;/option&gt;                
        &lt;/select&gt;
    &lt;/span&gt;
    &lt;span class="trackTime2"&gt;&lt;/span&gt;
    &lt;span class="trackTime3"&gt;&lt;/span&gt;
&lt;/div&gt;
</code></pre>

<p>now, for example, if I select the value <code>3</code> from <code>#line2</code> I'd like to change the value of the next select boxex (so the ones on <code>#line3</code> and <code>#line4</code>) in <code>3</code>.</p>
