How can I toggle between checking and unchecking all the checkboxes in an array.. for example.. name="checkbox[]"

I have this so far

function toggleCheck(fn) {
if(fcheck == 1) {
for (i = 0; i < fn.length; i++) {
fn.checked = false;
}
fcheck = 0;
} else {
for (i = 0; i < fn.length; i++) {
fn.checked = true;
}
fcheck = 1;
}
}

aryChk=document.getElementsByTagName('input');
for(cptChk=0;cptChk<aryChk.length;cptChk++){
  elem=aryChk[cptChk]
  if( (elem.type.lower()=='checkbox') && (elem.checked==false) ){
    elem.checked=true;
  }
}

This should do nicely...

That checks all the checkboxes on the page right?

I just want a function where you just put the array's name in and it toggles the check.. the checkboxes names are arrays though e.g name[]

Then add an check condition in the if...