Gaps between Title, Post and Comments

Anybody know what how to solve this problem?

Image

There are huge gaps under the title and under the post in my index.php theme file. Its really annoying. The gaps are twice as big in IE as well. I have removed all the CSS code for this to see if it would fix but it doesnt. The code im using is;

<div id="textbox">
<!--Post begin-->
<a href="<?php the_permalink(); ?>"><?php the_title(); ?></a>
Posted on <?php the_time('F j, Y'); ?> by <?php the_author_posts_link(); ?>
<?php comments_popup_link('Leave a comment', '1 Comment', '% Comments', '', 'Comments are off'); ?>
<?php the_content('Continue reading…');?>
<?php the_tags('Tags: ', ', ', ''); ?>
<?php trackback_rdf(); ?>
<!--Post end-->
</div>

#textbox {
	padding-right: 10px;
	padding-left: 10px;
}

I figure the problem is probably a <p> </p> tags in one of the core files, but im not sure where to start to look.