code not working in IE6 and IE8

hi

asp.net 2.0

I have this markup on my webpage. in the code I try to change the background
color of this div. but the background color isn't changed...
<div id="divQuery" runat="server" visible="false"
style="background-color:#0078ad; color:White; text-align:center;
font-size:12px; font-weight:bolder; font-family:Verdana; padding-bottom:5px;
padding-top:5px;">
    <asp:Literal ID="litQuery" runat="server"></asp:Literal>
</div>

this is the code I use to change the background color:
if (Request.Path == "/test/games.aspx")
 divQuery.Style["background-color"] = "#434087";

This code works in IE7, Opera and FiewFox but not in IE6, IE8

I've seen in the html output of the page that the div above has the
backg ...