function persian_key(field)
{
var key;
if (window.event)
  key = window.event.keyCode;
  if (key<128 && key>31 && key!=32)
  {
    if (window.event) window.event.keyCode='!"#$%،گ)(×+و-./0123456789:ک,=.؟@ِذ}ىُیلا÷ـ،/’د×؛َءٍف‘{ًْإ~جژچ^_پشذزیثبلاهتنمئدخحضقسفعرصطغظ<|>ّ'.charCodeAt(key-33);
  }
}