body
    {
        font: normal 12px auto "Trebuchet MS", Verdana;   
        background-color: #ffffff;
        color: #4f6b72;      
    }
 
    .popUpStyle
    {
        font: normal 11px auto "Trebuchet MS", Verdana;   
        background-color: #ffffff;
        color: #4f6b72; 
        padding:6px;     
        filter: alpha(opacity=80);
        opacity: 0.8;
    }
   
    .drag
    {
         background-color: #dddddd;
         cursor: move;
         border:solid 1px gray ;
    }

This main problem is filter

filter: alpha(opacity=80);
        opacity: 0.8;

Just use opacity:value without filter it works fine in firefox not sure about opera,chrome and safari.It's a no go zone for IE.

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