IE CSS半透明的注意事项

<style type="text/css"><!--
.tm {
filter:alpha(opacity=50);
opacity: 0.5;
-moz-opacity:0.5;
background-color:#000000;
width:100%;
color:#ffffff;
}
.tp {
background-color:#ff00ff;
vertical-align: bottom;
height: 226px;
width: 140px;
}
--></style>
<style type="text/css" mce_bogus="1">.tm {
filter:alpha(opacity=50);
opacity: 0.5;
-moz-opacity:0.5;
background-color:#000000;
width:100%;
color:#ffffff;
}
.tp {
background-color:#ff00ff;
vertical-align: bottom;
height: 226px;
width: 140px;
}</style>
<table border="0" cellspacg="0" cellpaddg="0" class="tp">
<tr>
<td valign="bottom">
<div class="tm">
asfasdfasd
</div>
</td>
</tr>
</table>