用JavaScript控制DIV的显示和隐藏

<script language="javascript" type="text/javascript">
            function showhide()
            ...{
                if(OaDoc.runtimeStyle.visibility=='visible')
                ...{
                    OaDoc.runtimeStyle.visibility='hidden'
                }
                else
                ...{
                    OaDoc.runtimeStyle.visibility='visible'
                }
            }
        </script>



<INPUT language="javascript"  id="btnConfirm2" onclick="showhide()" type="button"  value="上传" name="btnConfirm2">

 然后写上一个层,

<DIV id="OaDoc" style="LEFT: 344px; VISIBILITY: hidden; WIDTH: 353px; POSITION: absolute; TOP: 377px; HEIGHT: 88px"
                align="center">
                ..............................
            </DIV>