Theme development

Hello to all.

I´m having a strange problem with the greenmarinee theme. Currently my front page looks fine in mozilla, but in IE it moves the articles down in position below the right sidebar. I´ve looked to the source code, and I view that there are some div tags not closed. Is a problem with the theme?

This is my front page: http://poquer-red.com

Ty in advance to all!

Any one image gallery, when selected, shows one row of thumbnails, and then more pages by number underneath. This leaves a largely empty page. What I want to do is to have those thumbnail spread in rows down the page, so I have about ten rows. How would I go about that?

It doesn't matter what template I try, but I get :

Fatal error: phptemplate_init(): Failed opening required '' (include_path='.:/usr/lib/php') in ./themes/engines/phptemplate/phptemplate.engine on line 55

with all installations of 4.6 on my local test computer. I do not have this problem with 4.6 before on my published site.

Whilst all works ook on my remote server, I've just returned to a fresh test installation of 4.6. and phptemplate, and I get this error with most themes, inc. my own custom, blix, freinds electric, blumarine, but not adc:
[code]Fatal error: phptemplate_init(): Failed opening required '' (include_path='.:/usr/lib/php') in ./themes/engines/phptemplate/phptemplate.engine on line 55[/code]

i've heard about the extra white space in php code, but this is happening with 'vanilla' downloads.
Cant understand it.

I found the search function doesn't work in non-standard themes like Blix and
Manji, but does in standard themes like bluemarine and friendselectric.

How can continue to work with on the non-standard theme I started on , but incorporate a working search function?

I checked page.tpl.php in Blix and in Manji, and they seem to have similar but not identical search function code as in the standard themes. I can see this is not a phptemplate/xtemplate issue.

I can't show the code here as posting won't allow it.

It seems these are default in Drupal through every theme - the triangles and squares used in the nav menu for collapsable and non-collapseable links.

I was wondering what I need to do to change this. I looked through/tinkered with the CSS, but I can't seem to find how to change them. I could just be missing something.

Any help is appreciated, thanks.