Change Tumblr hiding my photoset - hide

Question

I want to make my theme show the photoset like it does with normal photos, but one under another.
I'm using this theme right now http://theme-neptune.tumblr.com/
And this is the code for the Photoset block
{block:Photoset}
{block:IndexPage}
<div class="photoset">
<div class="box">
<div class="hover">
PHOTOSET
See full set
</div>
</div>
{Photoset-250}
</div>
{/block:IndexPage}
{block:PermalinkPage}
{Photoset-500}
{/block:PermalinkPage}
{block:IndexPage}
{block:ifshowcaption}
{block:Caption}
<div class="caption photo_caption">{Caption}</div>{/block:Caption}
{/block:ifshowcaption}
{/block:IndexPage}
{/block:Photoset}
Im totally new to all this, I need help.

Answer 1

Photoset Photos
You can loop through the photos in a photoset using {block:Photos}:
{block:Photoset}
{block:Photos}
<img src="{PhotoURL-250}">
{/block:Photos}
{/block:Photoset}
This will output each photo as an img element. Below is the markup for the OP's question:
{block:Photoset}
{block:IndexPage}
<div class="photoset">
<div class="box">
<div class="hover">
PHOTOSET
See full set
</div>
</div>
{block:Photos}
<img src="{PhotoURL-250}"{block:Caption} alt="{PlaintextCaption}"{/block:Caption}>
{/block:Photos}
</div>
{/block:IndexPage}
{block:PermalinkPage}
{block:Photos}
<img src="{PhotoURL-500}"{block:Caption} alt="{PlaintextCaption}"{/block:Caption}>
{/block:Photos}
{/block:PermalinkPage}
{block:IndexPage}
{block:ifshowcaption}
{block:Caption}
<div class="caption photo_caption">{Caption}</div>{/block:Caption}
{/block:ifshowcaption}
{/block:IndexPage}
{/block:Photoset}