function filterdependantDropdown(filteringField, first){
  var filteredFieldName = filteringField.filteredName.replace("_","-");
	var filteredField = document.getElementById("edit-"+filteredFieldName+"-keys");
	var curr = filteredField.options[filteredField.selectedIndex].value; 
  filteredField.options.length = 0;  
  var ops = js_options[filteringField.options[filteringField.selectedIndex].value];
  for (i in ops){
    var opt = document.createElement('option');
    opt.value = opt.text = ops[i];
    try{filteredField.options.add(opt, null);} catch(ex) {filteredField.options.add(opt);}
  }
  if(first){
    for (i=0; i < filteredField.options.length; i++){
      if(filteredField.options[i].value==curr) filteredField.options[i].selected = true;
    }
  }
}

function dependantDropdownAutoAttach() {
  $('select.filteringField').each(function(){
    this.filteredName = this.title; this.removeAttribute('title');
    this.onchange = function(){ filterdependantDropdown(this, false);}
		filterdependantDropdown(this, true);
	} );
}

if (Drupal.jsEnabled) $(document).ready(dependantDropdownAutoAttach);