Java script function for CheckAll

function checkAll(ref) {
var chkAll = document.getElementById('checkAll');
var checks = document.getElementsByName('del[]');
var removeButton = document.getElementById('removeChecked');
var boxLength = checks.length;
var allChecked = false;
var totalChecked = 0;
if ( ref == 1 ) {
if ( chkAll.checked == true ) {
for ( i=0; i < boxLength; i++ ) {
checks[i].checked = true;
}
}
else {
for ( i=0; i < boxLength; i++ ) {
checks[i].checked = false;
}
}
}
else {
for ( i=0; i < boxLength; i++ ) {
if ( checks[i].checked == true ) {
allChecked = true;
continue;
}
else {
allChecked = false;
break;
}
}
if ( allChecked == true ) {
chkAll.checked = true;
}
else {
chkAll.checked = false;
}
}
for ( j=0; j < boxLength; j++ ) {
if ( checks[j].checked == true ) {
totalChecked++;
}
}
removeButton.value = "Remove ["+totalChecked+"] Selected";
}