Transparent background not showing in IE

i'm trying 开发者_Go百科to set the background transparent as

.dropdown dd ul li {
    background-color: rgba(238,238,238,0.7); 

its working fine in all browsers except IE, in IE it just shows the white background.

Regards.

I think IE has a problem with rgba. You might want to check out the post.

IE browsers before IE9 do not support RGBA colors. The "usual" way to solve that would be to use a PNG image with opacity (IE7+). Quick Google search also revealed this hack.