IE6 css issue for div tag

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CSS

Hi

My Dialog box is not open in IE6 however works fine for all other

css class include

.popupForm
{
    width: 700px;
    display: none;
    border: solid black 1px;
    position: absolute;
    z-index: 200;
    top: 100px;
    left: 130px;
    background-color: #FFFFFF;
}
.popupFormToolbar
{
    font-size: 12px;
    font-weight: bold;
    width: 100%;
    height: 25px;
    color: White;
    background-color: #5f5f5f;
    vertical-align: middle;
    padding: 5px 10px 0;
}
.popupBackgroundFader
{
    display: none;
    position: absolute;
    width: 100%;
    height: 100%;
    left: 0px;
    top: 0px;
    background-color: #FFFFFF;
    filter: alpha(opacity=80);
    -moz-opacity: .80;
    opacity: .80;
    z-index: 100;
}

HTML includes

<div id="popupBackgroundFader" class="popupBackgroundFader"  önclick="return false;">
</div><div id="dvTest" class="popupForm" style="width: 350px; height: 135px">
<div class="popupFormToolbar" style="width: 330px">  </div>
<table>content</table></div>

click on button open dvTest . it won't work for IE6 , while all other it works fine can you help me to solve this issue