什么代码使隐藏的文本框和按钮显现

[mustapha]

初始我设定文本框和按钮隐藏，我想点击另一个按钮后显现，代码为：
add.style.visibility="visible" 但提示add.style不是对象，正确的代码应该怎么写？

[seabell]

<input type=text name=add style="visibility:hidden">
<input type=button onclick='document.all.add.style.visibility="visible"'>

[黑马]

好象把style的display设置为空就可以的：）

[gq]

<form name=mxh3>
<div id=mxh1 style="position:absolute;visibility: hidden"><input value="dtest" type="text"></div>
<div id=mxh2 style="position:absolute;visibility: hidden"><input value="d" type="text"></div>
<!--<input name=aa type=radio onclick="document.all.mxh2.style.visibility='visible'">显示--><br><br>
<input name=aa type=radio onclick="change()">显示
<input name=aa type=radio onclick="change1()">隐藏
<!--<input name=aa type=radio onclick="document.all.mxh2.style.visibility='hidden'">隐藏-->
</form>
<script>
function change(){
document.all.mxh2.style.visibility='visible';
document.all.mxh1.style.visibility='hidden';
}
function change1(){
document.all.mxh2.style.visibility='hidden';
document.all.mxh1.style.visibility='visible';
}
</script>