jQuery change logo on section : <p>I have for so long searched on how to do like this website has done with their logo:</p>

<p><a href="http://www.shiftbrain.co.jp/works/dcc_2015" rel="nofollow">http://www.shiftbrain.co.jp/works/dcc_2015</a></p>

<p>The logo changes, what I believe on reaching a section. Does anyone know how to make this with jQuery?</p>

<p>Say I have 2 different sections, one with the class "white" and the other with the class "dark". On reaching the "white" section, I'd like a logo to swap to a dark logo and vice versa. </p>
