SWF banner white line issue

Hello,

I have inserted a flash swf banner on my WordPress site (successfully) using the WP-SWFObject plugin. However, now there is an annoying white line right above my banner which does not seem to be caused by any margin or padding issues within the page. As far as I can tell, it’s not the swf file that is the problem.

The code where my banner is inserted (within index.php):

<div id="flash" width="950" height="223" style="overflow:hidden;margin-top:0;padding-top:0;width:100%; height:100%;">
	  <?php wp_swfobject_echo("http://mysitehere.com/slider.swf", "950", "225"); ?></div>

Above that in the code there is:

<?php global $theme; get_header(); ?><div id="main"><?php $theme->hook('main_before'); ?>

the css style properties of main and header are:

#main {
	padding-left: 0px;
	padding-right:0px;
	margin:0 auto;
	padding-top:0px;
	padding-bottom:0px;

}

#header {
height: 126px;
   padding-top:1px;
   padding-bottom:0px;
  position: relative;
  width:100%;
  margin-top:;
  margin-bottom: 0;
  margin-top:0px;
  margin-bottom: 0;
  background-color:#442b17;
  background-image: url(19.png);
  background-repeat:no-repeat;
  background-position:center center;
}

any thoughts?