点击显示下拉菜单的代码

<p>要完成此效果把如下代码加入到&lt;body&gt;区域中</p><p>&lt;SCRIPT LANGUAGE="JavaScript"&gt;<br />&lt;!-- Begin<br />var refer=true;<br />function combo() {<br />if (refer) {<br />&nbsp; document.all.contents.style.visibility="visible";<br />&nbsp; refer=false;<br />}<br />else {<br />&nbsp; document.all.contents.style.visibility="hidden";<br />&nbsp; refer=true;<br />}<br />}<br />//&nbsp; End --&gt;<br />&lt;/script&gt;&lt;table align="center"&gt;<br />&lt;tr&gt;&lt;td&gt;<br />&lt;table width="200" border="1" cellspacing="0" cellpadding="0" bordercolor="#d8d8d8"&gt;<br />&nbsp; &lt;tr&gt;<br />&nbsp;&nbsp;&nbsp; &lt;td bgcolor="FF9900"&gt;<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;font face="verdana" size="2" color=FFFFFF&gt; 下拉“COOL”单<br />&nbsp;&nbsp;&nbsp; &lt;/td&gt;<br />&nbsp;&nbsp;&nbsp; &lt;td align="right" width="21"&gt;<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;img src="<a target=_blank href="http://www.alixixi.com/UploadPic/userface/no1323.jpg">http://www.alixixi.com/UploadPic/userface/no1323.jpg</a>" name="combo_arrow" width="21" height="21" alt="" border="0" onclick="combo()" &gt;&lt;/td&gt;<br />&nbsp; &lt;/tr&gt;<br />&lt;/table&gt;<br />&lt;div id="contents" style="position:absolute; left:?px; top:?px; width:?px; height:?px; z-index:1; visibility:hidden"&gt;<br />&nbsp; &lt;table width="200" border="1" cellspacing="0" cellpadding="0" bordercolor="#d8d8d8"&gt;<br />&nbsp; &lt;tr&gt;<br />&nbsp;&nbsp;&nbsp; &lt;td bgcolor="FF9900"&gt;<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;font face="verdana" size="2"&gt;<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;a href="#" target="_blank"&gt; &lt;img src="<a target=_blank href="http://img.alixixi.com/icon_indextool.gif">http://img.alixixi.com/icon_indextool.gif</a>" border="0" width="8" height="8"&gt;&nbsp; LINK&lt;/a&gt;</p><p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;a href="#" target="_blank"&gt; &lt;img src="<a target=_blank href="http://img.alixixi.com/icon_indextool.gif">http://img.alixixi.com/icon_indextool.gif</a>" border="0" width="8" height="8"&gt;&nbsp; LINK&lt;/a&gt;</p><p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;a href="#" target="_blank"&gt; &lt;img src="<a target=_blank href="http://img.alixixi.com/icon_indextool.gif">http://img.alixixi.com/icon_indextool.gif</a>" border="0" width="8" height="8"&gt;&nbsp; LINK&lt;/a&gt;</p><p>&nbsp;&nbsp;&nbsp; &lt;/td&gt;<br />&nbsp; &lt;/tr&gt;<br />&lt;/table&gt;<br />&lt;/td&gt;&lt;/tr&gt;<br />&lt;/table&gt;</p><p>&nbsp;</p>