<html>
<head>
</head><body >
<script language="javascript">
function check()
{
v = document.getElementById("book")
v.style.visibility ='';
}
</script><form name="form1" method="post" action="">
<label>
<input type="radio" name="check1" value="radiobutton" onClick="check()">
</label>
<label>
<input type="text" id="book" style="visibility:hidden">
</label>
</form></body></html>
<head>
</head><body >
<script language="javascript">
function check()
{
v = document.getElementById("book")
v.style.visibility ='';
}
</script><form name="form1" method="post" action="">
<label>
<input type="radio" name="check1" value="radiobutton" onClick="check()">
</label>
<label>
<input type="text" id="book" style="visibility:hidden">
</label>
</form></body></html>
function check()
{
document.getElementById("input").disabled = !(document.getElementById("input").disabled);
document.getElementById("check").checked = !(document.getElementById("check").checked);
}
</script>
<input type="radio" id="check" value="radiobutton" onClick="check()">
<input type="text" id="input" disabled="true">