<script type="text/javascript">
function check_all(){
var all_inputs = document.getElementsByTagName("input");
for(i=0; i<all_inputs.length; i++){
if(all_inputs[i].type=="checkbox" && all_inputs[i].className=="check_uncheck"){
all_inputs[i].checked = "checked";
}
}
}
function uncheck_all(){
var all_inputs = document.getElementsByTagName("input");
for(i=0; i<all_inputs.length; i++){
if(all_inputs[i].type=="checkbox" && all_inputs[i].className=="check_uncheck"){
all_inputs[i].checked = "";
}
}
}
</script>
then set "check_uncheck" the classes of checkboxes which must check/uncheck (Example: <input type="checkbox" name="checkbox">) and set onclick="check_all()" to element on click which the checkboxes will be checked and onclick="uncheck_all()" to element on click which the checkboxes will be unchecked (Example: <input type="button" value="Check" onclick="check_all()"> <input type="button" value="Uncheck" onclick="uncheck_all()">).
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