function checkError() {
   if (document.FormSignin.logonId.value=="") {
     alert("Please enter your 'MCCO member ID'");
     document.FormSignin.logonId.focus();
     return false; //Do not submit
   } else {
     if (document.FormSignin.logonId.value.length<6) {
       alert("'MCCO member ID' should be at least 6 characters");
       document.FormSignin.logonId.focus();
       return false; //Do not submit
     }
     if ( !validString(document.FormSignin.logonId.value,"IsLetterOrDigit") ) {
       alert("Invalid input! Please enter 'MCCO member ID' again.");
       document.FormSignin.logonId.focus();
       return false; //Do not submit
     }	
   }	
   if (document.FormSignin.passwd.value=="") {
     alert("Please enter your 'Password'");
     document.FormSignin.passwd.focus();
     return false; //Do not submit
   } else {
     if (document.FormSignin.passwd.value.length<6 || document.FormSignin.passwd.value.length>12) {
       alert("'Password' should be 6-12 characters");
       document.FormSignin.passwd.focus();
       return false; //Do not submit
     }
     if ( !validString(document.FormSignin.passwd.value,"IsPwd") ) {
       alert("Invalid input! Please enter 'Password' again.");
       document.FormSignin.passwd.focus();
       return false; //Do not submit
     }	
   }
   
   return true;
}