<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title> New Document </title>
<meta name="Generator" content="EditPlus">
<meta name="Author" content="">
<meta name="Keywords" content="">
<meta name="Description" content="">
<script>
function selectAll(){
for ( var i = 0 ; i <document.getElementById("td1").childNodes.length; i ++ ){
var obj = document.getElementById("td1").childNodes[i];
if (obj && obj.type && obj.type == "checkbox" )
obj.disabled = true ;
}
}
</script>
</head>
<body>
<table border =1 cellpadding =0 cellspacing =0 width =300>
<tr>
<td id ="td1">
<input type ="button" value = click onclick ="selectAll()"><br>
<input type ="checkbox"> 1 <br>
<input type ="checkbox"> 2 <br>
<input type ="checkbox"> 3 <br>
<input type ="checkbox"> 4 <br>
<input type ="checkbox"> 5 <br>
<input type ="checkbox"> 6 <br>
<input type ="checkbox"> 7 <br>
</ td>
</ tr>
<tr>
<td id =td2>
<input type ="checkbox"> 11 <br>
<input type ="checkbox"> 12 <br>
</ td>
</ tr>
</ table>
</body>
</html>