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function checkAll(){
var num = 0;
for (var i = 0; i < checks.length; i++) {
if (checks[i].checked) {
num++;
a = proNumcs[i].innerHTML;
producttotal = producttotal + a;
}else{
// producttotal = producttotal - a;
}
}
if (num == checks.length) {
alltop.checked = true;
allbuttom.checked = true;
}else{
alltop.checked = false;
allbuttom.checked = false;
}
}