.tip {font:11px
     verdana, Arial,Helvetica,sans-serif; border:solid 1px
     #FAF8CC; width:20px; padding:1px;
     opacity:0.9;	
     position:absolute; z-index:100;
     visibility:hidden; color:#FAF8CC; top:20px;
     left:90px; background-color:#C11B17;
     layer-background-color:#ffffcc;}

/* and this CSS for IE, if you want to use transparency: */

.tip{
 	filter:progid:DXImageTransform.Microsoft.Alpha(opacity=90);
}