显示/隐藏层的脚本

<script language="JavaScript" type="text/JavaScript">
<!--
function show_hide(targetid){
        if (document.getElementById){
                target=document.getElementById(targetid);               
                        if (target.style.display==""){
                                target.style.display="none";
                        } else if(target.style.display=="none") {
                                target.style.display="block";
                        } else if(target.style.display=="block"){
                                target.style.display="none";
                        }                      
        }
}
-->
</script>

   调用方法:

<input id="Button1" type="button" value="button" onclick="show_hide('Panel1')"  />