CSS Popup Image Viewer problem

[Mistrie]

I'm pretty new to CSS, but I used the CSS Popup Image Viewer on a web page that I'm making. It does everything that it is supposed to do, but I put it in a scroll box. So the pop-up image shows up inside the box, causing most of the image to be hidden. Is there a way I can make it pop up outside of the box?

[bisunath]

.thumbnail span {
background-color:lightyellow;
border:1px dashed gray;
color:black;
display:block;
height:200px;
left:-1000px;
overflow:auto;
padding:5px;
position:absolute;
text-decoration:none;
visibility:hidden;
width:200px;
}

original css is below just change .thumbnail span which written over

<style type="text/css">

/*Credits: Dynamic Drive CSS Library */
/*URL: http://www.dynamicdrive.com/style/ */

.thumbnail{
position: relative;
z-index: 0;
}

.thumbnail:hover{
background-color: transparent;
z-index: 50;
}

.thumbnail span{ /*CSS for enlarged image*/
position: absolute;
background-color: lightyellow;
padding: 5px;
left: -1000px;
border: 1px dashed gray;
visibility: hidden;
color: black;
text-decoration: none;
}

.thumbnail span img{ /*CSS for enlarged image*/
border-width: 0;
padding: 2px;
}

.thumbnail:hover span{ /*CSS for enlarged image on hover*/
visibility: visible;
top: 0;
left: 60px; /*position where enlarged image should offset horizontally */

}

</style>

[Mistrie]

I tried changing it. But the image is still popping up inside the scroll box. Do I have to change something to the HTML portion of it too?