That took me a long time to figure out. I think your trying to make a modal progress indicator. You have to use %
So you make a mask first, and overlay the progress on it
<div style="background-color: rgb(0,0,0); width: 100%; height: 100%; zindex: 10001; position: fixed; top: 0px; left: 0px; filter: alpha(opacity=60); -moz-opacity: .60; opcacity: .6;"></div>
<div style="width: 140px; height: 46px; textalign: center; margin: 0px auto; zindex: 100010; position: absolute; top: 45%; left: 45%; background-color: rgb(0,0,0); border: olid 2px rgb(255,255,255); -moz-border-radius: 10px; border-radius: 10px;">
<table>
<tr>
<td><img src="" /><span>Working ...</span></td>
</tr>
</table>
</div>