how to bring the second div on the same line of the first div

I downloaded a image gallery script which dislays a big image in the middle and the thumbnail images below the big image. The decription of the image is displayed in a seperate div just below the big image. Now, the description is going to be bigger, so I want that div to come next to the big image, how to do this.

I am attaching the screen shots, code snippets of the index.php page, css and js files.

Any help is appreciated
Thanks

<div id="dhtmlgoodies_slideshow">
<div id="previewPane" align="center" ><br />
<img src="ads/<? echo $fname?>" height="200" /> <span id="waitMessage">Loading image. Please wait</span>
 
<div id="largeImageCaption"><?=$rs['content']?></div>
</div>
<div id="galleryContainer">
<div id="arrow_left" style="height:60px; background-color:#FFFFFF"><img src="arrow_left.gif" height="68" /></div>
<div id="arrow_right"><img src="arrow_right.gif" height="68" /></div>
<div id="theImages">
<!-- Thumbnails -->
<?	
$imgcnt=0;
while($rs=mysql_fetch_array($query1)){
$imgcnt++;
$fname = $rs['videoname'];
$mysock = getimagesize("ads/". $fname);
$target=150;
$width=$mysock[0];
$height=$mysock[1];
if ($width > $height) { 
$percentage = ($height / $width); 
$width=$target;
$result="width=\"$width\"";
} else { 
$percentage = ($width / $height); 
$height = $target;
$result="height=\"$height\"";
} 
echo "<a href=\"#\" onclick=\"showPreview('ads/".$fname."','".$imgcnt."');return false\"><img src=\"ads/".$fname."\" height=\"70\"></a>";
		} //while
}// if num rows
else{
echo "<br><span class=\"verysmall\">No Picture Gallery.</span><br>";
}
?>
<!-- End thumbnails -->
 
<!-- Image captions -->
<?
mysql_data_seek($query1, 0);
while($rs=mysql_fetch_array($query1)){?>
<div class="imageCaption"><?=$rs['content']?></div>
<? } ?>
<!-- End image captions -->
<div id="slideEnd"></div>
</div> <!-- for "theImages" -->
</div> <!-- for "galleryContainer" -->
</div> <!-- for "dhtmlgoodies_slideshow -->

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gallery.jpg
gallery-new.jpg
image-slideshow.css.txt
image-slideshow.js.txt