<select name=se style="display:none">
<option>asdf</option>
</select>
<input type="button" onclick="se.style.display='inline'" value="show">
<option>asdf</option>
</select>
<input type="button" onclick="se.style.display='inline'" value="show">
调试欢乐多
document.form1.se.style.visibility="hidden";
document.form1.se.style.position="absolute";
</script>
<option>asdf</option>
</select>
<input type="button" onclick="if(se.style.display=='inline'){se.style.display='none';this.value='show';}else{se.style.display='inline';this.value='hide';}" value="show">
<span onclick="document.all('s1').style.display='none'">user display</span>
<span onclick="document.all('s1').style.display='block'">show </span>
<br>
<select id="s2"></select>
<span onclick="document.all('s2').style.visibility='hidden'">user visibility</span>
<span onclick="document.all('s2').style.visibility='visible'">show </span>