function validateForm(frm)
   {
    var errorStr = "";
    var requiredFields = Array( "Name", "Email", "Message" );
    for( i in requiredFields )
     if( frm[requiredFields[i]].value.length == 0 )
      errorStr += (errorStr == "" ? "" : ", ") + requiredFields[i];
    if( errorStr != "" )
     alert("Please complete these missing fields : " + errorStr);
    return errorStr == "";
   }