Span tag spooks in my design

[alxla]

If i delete the span tag wich is some were near line 137 on my site: http://www.testzone.se/demo
The bottom of the inner border will disappear, wery strange i think, that an unclosed span tag does that :S
This is the tag in html: <span class="searchboxcontent">
And defined in my .css: .searchboxcontent {
padding: 10px 0 0 0;}

If i delete the line that defines it in the css file the same thing happens as if i removes the span tag.

Does anyone have a clue why this is?

[bathurst_guy]

First fix the validation errors specifically all the "id"
Line 98 column 12: ID "NEWSCONTAINER" already defined.
Line 99 column 12: ID "NEWSHEAD" already defined.
Line 101 column 13: ID "NEWSTITLE" already defined.
etc etc

[alxla]

Ok, I know there is "some" things with my code that i should fix, but does that affect that the span tag spooks?

EDIT: Fixed the id's now anyway