How to replace html code via Javascript?

Question

JavaScript

how to shorten links in html code with JS?
For example, there is such a piece

<a href="http://site.site/uploads/posts/2009-01/1.gif" ><img src="/uploads/posts/2009-01/thumbs/1.gif" tooltip="Описание"></a>

and turn it into

<a href="/1.gif" ><img src="/1.gif" tooltip="Описание"></a>

Answer 1

I don't know what it makes sense, but if it's necessary, then:

<a id="site-link"> <img tooltip="Описание" id="site-photo"></a>

document.querySelector('#site-link').setAttribute('href', 'http://site.site/uploads/posts/2009-01/1.gif');
document.querySelector('#site-photo').setAttribute('src', '/uploads/posts/2009-01/thumbs/1.gif');