var foo = document.form1;
 var controlCode;
 
 controlCode = foo.Ioctl.value;
 
 var device = new Array(55);
 device[1]="BEEP"
 device[2]="CD_ROM"
 device[3]="CD_ROM_FILE_SYSTEM"
 device[4]="CONTROLLER"
 device[5]="DATALINK"
 device[6]="DFS"
 device[7]="DISK"
 device[8]="DISK_FILE_SYSTEM"
 device[9]="FILE_SYSTEM"
 device[10]="INPORT_PORT"
 device[11]="KEYBOARD"
 device[12]="MAILSLOT"
 device[13]="MIDI_IN"
 device[14]="MIDI_OUT"
 device[15]="MOUSE"
 device[16]="MULTI_UNC_PROVIDER"
 device[17]="NAMED_PIPE"
 device[18]="NETWORK"
 device[19]="NETWORK_BROWSER"
 device[20]="NETWORK_FILE_SYSTEM"
 device[21]="NULL"
 device[22]="PARALLEL_PORT"
 device[23]="PHYSICAL_NETCARD"
 device[24]="PRINTER"
 device[25]="SCANNER"
 device[26]="SERIAL_MOUSE_PORT"
 device[27]="SERIAL_PORT"
 device[28]="SCREEN"
 device[29]="SOUND"
 device[30]="STREAMS"
 device[31]="TAPE"
 device[32]="TAPE_FILE_SYSTEM"
 device[33]="TRANSPORT"
 device[34]="UNKNOWN"
 device[35]="VIDEO"
 device[36]="VIRTUAL_DISK"
 device[37]="WAVE_IN"
 device[38]="WAVE_OUT"
 device[39]="8042_PORT"
 device[40]="NETWORK_REDIRECTOR"
 device[41]="BATTERY"
 device[42]="BUS_EXTENDER"
 device[43]="MODEM"
 device[44]="VDM"
 device[45]="MASS_STORAGE"
 device[46]="SMB"
 device[47]="KS"
 device[48]="CHANGER"
 device[49]="SMARTCARD"
 device[50]="ACPI"
 device[51]="DVD"
 device[52]="FULLSCREEN_VIDEO"
 device[53]="DFS_FILE_SYSTEM"
 device[54]="DFS_VOLUME"
//
// decodeIt
// 
// Decodes an IOCTL value
//
 function decodeIt() {
  var access;
  var method;
  var input;
  var deviceVal;
  var funcVal;
  input = parseInt(foo.Ioctl.value, 16);
  if(isNaN(input)) {
   alert(foo.Ioctl.value+"is not a valid IOCTL value");
   return;
  }
  deviceVal = (input >> 16) & 0xFFF;
  funcVal = (input >> 2) & 0xFFF;
  if ((deviceVal <= 54) && (deviceVal != 0)) {
    foo.Device.value = device[deviceVal]+
        " (0x"+deviceVal.toString(16)+")";
  } else {
   foo.Device.value = "0x"+deviceVal.toString(16);
  }
  foo.Func.value = "0x"+funcVal.toString(16);
  
  access = (input >> 14) & 3;   
  method = input & 3;
  if (access == 0) {
   foo.Access.value = "FILE_ANY_ACCESS";
  } else {
   if (access == 1)  {
    foo.Access.value = "FILE_READ_ACCESS";
   } else {
    if (access == 2) {
     foo.Access.value = "FILE_WRITE_ACCESS";
    } else {
     if (access == 3) {
      foo.Access.value = "Read and Write";
     }
    }
   }
  }
  if (method == 0) {
   foo.Method.value = "METHOD_BUFFERED";
   } else {
   if (method == 1) {
    foo.Method.value = "METHOD_IN_DIRECT";
   } else {
    if (method == 2) {
     foo.Method.value = "METHOUD_OUT_DIRECT";
     } else {
     if(method == 3) {
      foo.Method.value = "METHOD_NEITHER";
     }
    }
   }
  }
 }