Opera problem. Uncomplete pop-up image

Hi to all!

this code works fine with IE 6 and mozilla, but doesn't work with Opera 9.0
[code]
<style>
a.screen, a.screen:visited {
color:#000000;
position:relative;
z-index:1;
}
a.screen b {
visibility:hidden;
position:absolute;
width:0; /* make the image zero size */
height:0; /* for Opera bug */
left:0px; /* position:the image */
top:0;
border:0; /* with no border */
}
a.screen:hover {
color:#000000;
text-decoration:none;
border:0; /* needed for this to work in IE */
z-index:1000;
}
a.screen:hover b {
visibility:visible; /* make the image visible */
border:1px solid #000000; /* add a border */
cursor:pointer; /* for IE */
}
</style>
<span bgcolor="#F69D9D" class="txt1"><?php if ($pampotezi1 != '') echo "<a class=\"screen\" href=\"#\" onClick=\"Start(-1, 5, '');\">Game saved ".$pamdatum1."<b><img src=\"slika.php?fen=".$fen1."\" title=\"website image\"></b></a>"; else echo "Nothing Saved!";?></span>&nbsp;<img src="../images/disk2.gif" width="18" height="18">&nbsp;<img src="../images/x.gif" width="15" height="15">
<br>
<span bgcolor="#F69D9D" class="txt1"><?php if ($pampotezi2 != '') echo "<a class=\"screen\" href=\"#\" onClick=\"Start(-1, 5, '');\">Game saved ".$pamdatum2."<b><img src=\"slika.php?fen=".$fen2."\" title=\"website image\"></b></a>"; else echo "Nothing Saved!";?></span>&nbsp;<img src="../images/disk2.gif" width="18" height="18">&nbsp;<img src="../images/x.gif" width="15" height="15">
<br>
<span bgcolor="#F69D9D" class="txt1"><?php if ($pampotezi3 != '') echo "<a class=\"screen\" href=\"#\" onClick=\"Start(-1, 5, '');\">Game saved ".$pamdatum3."<b><img src=\"slika.php?fen=".$fen3."\" title=\"website image\"></b></a>"; else echo "Nothing Saved!";?></span>&nbsp;<img src="../images/disk2.gif" width="18" height="18">&nbsp;<img src="../images/x.gif" width="15" height="15">
<br>
<span bgcolor="#F69D9D" class="txt1"><?php if ($pampotezi4 != '') echo "<a class=\"screen\" href=\"#\" onClick=\"Start(-1, 5, '');\">Game saved ".$pamdatum4."<b><img src=\"slika.php?fen=".$fen4."\" title=\"website image\"></b></a>"; else echo "Nothing Saved!";?></span>&nbsp;<img src="../images/disk2.gif" width="18" height="18">&nbsp;<img src="../images/x.gif" width="15" height="15">
<br>
<span bgcolor="#F69D9D" class="txt1"><?php if ($pampotezi5 != '') echo "<a class=\"screen\" href=\"#\" onClick=\"Start(-1, 5, '');\">Game saved ".$pamdatum5."<b><img src=\"slika.php?fen=".$fen5."\" title=\"website image\"></b></a>"; else echo "Nothing Saved!";?></span>&nbsp;<img src="../images/disk2.gif" width="18" height="18">&nbsp;<img src="../images/x.gif" width="15" height="15">
[/code]

you can go and check:
http://www.gensunasumus.com/movebymoveajax/navigator4.php

Opera shows only one part of image.

Can someone tell me what I'm doing wrong.
Best Regards and thankx in advance.