//All button processing
$(function(){
//Click on the selection
$("#checkAll").click(function () {//When you click the all - box
var flag = $("#checkAll").is(":checked");//Determines the state of all selected buttons
var checkItems=document.getElementsByName("checkItem");
for(var i=0;i<checkItems.length;i++){
checkItems[i].checked = flag;
}
});
//Click on the item
$("input:checkbox[name='checkItem']").each(function(){
$(this).click(function(){
if($("input:checkbox[name='checkItem']:checked").length==$("input:checkbox[name='checkItem']").length){
document.getElementById("checkAll").checked = true;
}else{
document.getElementById("checkAll").checked = false;
}
});
});
});