// -------------------------------------------------------------------------
function hide_div(box) {
   box.style.display="none";
}
// -------------------------------------------------------------------------
function hide_div_all (box) {
   var els = box.getElementsByTagName('div');
   for (var j = els.length; j-- > 0; ) {
      els[j].style.display="none";
   }
}
// -------------------------------------------------------------------------
function show_div_only (box, parent) {
   hide_div_all(parent);
   box.style.display="block";
}
// -------------------------------------------------------------------------
// Written by: WillyDuitt@hotmail.com
function disableSelects(form){
   for(var i=form.elements.length; i-->0;){
      var input = form.elements[i];
      if(input.type.match(/select/i) &&
            input.name.match(/^sel_/i)){
         input.disabled = 1;
      } else if (input.type.match(/checkbox/i) && input.name.match(/^en_/i)) {
         if (input.onchange)
            input.onchange();
      }
   }
}
// -------------------------------------------------------------------------