버튼 투명처리 후 배경

[html]

<button name="" class="btnCal"><span>날짜선택</span></button>

[css]

 

 .btnCal { width:26px; height:25px; border:none; background-color:transparent; background-image:url(../images/sub/btnCal.png); background-repeat:no-repeat; background-position:0 0; text-indent:-9999px;}