Change Photoset Max Width to 340px? - tumblr

Question

Having some issues trying to get my photoset width to 340px without messing up the way the smaller photos in the photoset display. http://d.pr/icuf
{block:Photoset}
{block:IndexPage}
<div class="photo_set">
<div class="header">
<h1>photoset</h1>
{block:NoteCount}<a href="{Permalink}">
<div class="note">{NoteCountWithLabel}</div></a>
{/block:NoteCount}
<div class="clear"></div>
</div>
<div class="view">
<a href="{Permalink}">
<div class="link">View Photoset ↦</div></a>
</div>
{Photoset-250}
</div>{/block:IndexPage}
{block:PermalinkPage}
<div class="perma_width">{Photoset-500}</div>
{/block:PermalinkPage}
{/block:Photoset}

Answer 1

You won't be able to get a 340px width using Tumblr's default code. You have two options:
1) Don't use Tumblr's {Photoset} tags and display each photo individually with {block:Photos}...{/block:Photos} and style them as you want.
2) Use a plugin like this: https://github.com/PixelUnion/Extended-Tumblr-Photoset (full disclosure, it's something that I wrote)