这不是标准CSS吗？BACKGROUND-IMAGE:url(images/bg.gif);

<input name="UserName" type="text" id="UserName" style=" BORDER-RIGHT:#8eabcc 1px solid; BORDER-TOP:#8eabcc 1px solid; FONT-SIZE:14px; BACKGROUND-ATTACHMENT:fixed; BACKGROUND-IMAGE:url(images/backend_inputbg.gif); MARGIN:0px; BORDER-LEFT:#8eabcc 1px solid; WIDTH:155px; COLOR:#c97600; BORDER-BOTTOM:#8eabcc 1px solid; BACKGROUND-REPEAT:no-repeat; FONT-FAMILY:'Arial Black', Impact, Arial; HEIGHT:23px" runat="server">

哦？ 只能小写？