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<input type="button" id="btnth" runat="server" class="topth" onclick="display('divth')" value="按钮"/>
<div id="divth" style="display:none;" class="ndiv" onmouseout="hide('divth')">
<ul>
<li><a>选择项</a></li>
<li><a>选择项</a></li>
<li><a>选择项</a></li>
</ul>
</div>
function display(id)
{
document.getElementById(id).style.display="block";
}
function hide(id)
{
document.getElementById(id).style.display = "none";
}
.ndiv
{
margin-top: -10px;
padding-right: 10px;
width: 136px;
height: 110px;
float: right;
z-index:999;
}
.ndiv ul
{
list-style-type:none;
background-color:White;
}
.ndiv ul li
{
text-align:center;
display: block;
}
.ndiv ul li:hover
{
background-color:Gray;
}