select all checkboxes in single check
<html> <title> select all checkboxes in single check </title> <head> <script language=javascript> checked=false; function checkedAll (form1) { var aa= document.getElementById('form1'); if (checked == false) { checked = true } else { checked = false } for (var i =0; i < aa.elements.length; i++) { aa.elements[i].checked = checked; } } </script </head> <body> <form name="form1" method="post" id="form1"> <table> <tr> <td><input type='checkbox' name='checkall' onclick='checkedAll(form1);'> </td> </tr> <tr> <td> </td> </tr> <tr> <td>Checkbox1: <input type='checkbox' name='chk'value=""> </td> <