<input name="a" type="checkbox" id="a" value="2" disabled>
<input name="a" type="checkbox" id="a" value="3" disabled>
<input name="a" type="checkbox" id="a" value="4" disabled>
<input name="a" type="checkbox" id="a" value="3" disabled>
<input name="a" type="checkbox" id="a" value="4" disabled>
<input name="a" type="checkbox" id="a" value="2" checked />
<input name="a" type="checkbox" id="a" value="3" checked />
<input name="a" type="checkbox" id="a" value="4" checked />
<br>
<input type="checkbox" checked onclick="selectAllCheckboxes('a',this.checked)" />
</form><script>
/**
* This function is to change all checkboxes to checked or unchecked.
* JK 2003-12-08
*/
function selectAllCheckboxes(nameOfCheckBox,trueOrFalse)
{
if(trueOrFalse==null) trueOrFalse=true;
var theCheckboxInputs=document.getElementsByName(nameOfCheckBox);
for (var i=0;i<theCheckboxInputs.length;i++)
theCheckboxInputs[i].checked=trueOrFalse;
}
</script>