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18 lines
446 B
JavaScript

function check_all(id) {
var obj = document.getElementById(id);
var boxes = obj.getElementsByTagName("input");
for(var i = 0; i < boxes.length; i++) {
if(boxes[i].type == "checkbox")
boxes[i].checked = true;
}
}
function uncheck_all(id) {
var obj = document.getElementById(id);
var boxes = obj.getElementsByTagName("input");
for(var i = 0; i < boxes.length; i++) {
if(boxes[i].type == "checkbox")
boxes[i].checked = false;
}
}