Se le combo sono disabilitate, si vedranno sempre grigie.
E questa dove l'hai sentita?
Vi posto questo codice, COPIA-INCOLLA ed il gioco è fatto.
codice:
<HTML>
    <HEAD>
        <TITLE>Select disabled</TITLE>
        <STYLE>
            SELECT{
                BORDER-TOP: 0px solid #ff0000;
                BORDER-BOTTOM: 0px solid #ff0000;
                BORDER-LEFT: 0px solid #ff0000;
                BORDER-RIGHT: 0px solid #ff0000;
                MARGIN-TOP: 0px;
                MARGIN-BOTTOM: 0px;
                MARGIN-LEFT: 0px;
                MARGIN-RIGHT: 0px;
                PADDING-TOP: 0px;
                PADDING-BOTTOM: 0px;
                PADDING-LEFT: 0px;
                PADDING-RIGHT: 0px;
                BACKGROUND-COLOR: #ffff00;
                FONT-FAMILY: Comic Sans MS;
                FONT-WEIGHT: 700;
                FONT-SIZE: 15px;
                FONT-STYLE: oblique;
                TEXT-TRANSFORM: capitalize;
                FONT-VARIANT: small-caps;
                WIDTH: 200px;
                HEIGHT: 20pt;
                COLOR: #000000;
                TEXT-DECORATION: underline overline line-through
            }
        </STYLE>
    </HEAD>
    <BODY>
        <SELECT disabled>
            <OPTION style="BACKGROUND-COLOR: transparent">Seleziona</OPTION>
            <OPTION style="BACKGROUND-COLOR: #ff0000;">Option1</OPTION>
            <OPTION style="BACKGROUND-COLOR: #00ff00;">Option2</OPTION>
            <OPTION style="BACKGROUND-COLOR: #0000ff;">Option3</OPTION>
        </SELECT>
    </BODY>
</HTML>