function keyRestrict(e, validchars) {
 var key='', keychar='';
 key = getKeyCode(e);
 if (key == null) return true;
 keychar = String.fromCharCode(key);
 keychar = keychar.toLowerCase();
 validchars = validchars.toLowerCase();
 if (validchars.indexOf(keychar) != -1) return true;
 if ( key==null || key==0 || key==8 || key==9 || key==13 || key==27 ) return true;
 return false;
}

function format(input) {
  input.value = input.value.toUpperCase(); 
  input.value = input.value.replace(/O/gi,"0");
  input.value = input.value.replace(/I/gi,"1");
  input.value = input.value.replace(/ /gi,"");
}