Using Transaction Object in ASP

Hi, I rewrore some of my code to include a transaction routine (I'm using JScript not VBScript) and got an error at:
if (connStudentInsert.Errors.Count > 0) {

saying connStudentInsert.Errors.Count is null or not an object.

earlier in the program I defined as follows:
var connStudentInsert = MM_connCharms_STRINGSQL;
which conects and opens successfully.

Here is the complete bit of code with the transaction stuff:

connStudentInsert.BeginTrans;
cmdInsert.CommandText = MM_editQuery;
cmdInsert.Execute();
cmdInsert.CommandText = cmdParents;
cmdInsert.Execute();
cmdInsert.CommandText = cmdStudetail;
cmdInsert.Execute();
if (connStudentInsert.Errors.Count > 0) {
if (connStudentInsert.Errors.Item[0].Number!= 0){
connStudentInsert.RollbackTrans;
Response.Write("Error Inserting Record: " + connStudentInsert.Errors.Item[0].Description);
}
}

cmdInsert.ActiveConnection.Close();
cmdInsert = null;

The three inserts work without a problem. Most times. Which is why I want to try the transactions to see why two are failing sometimes.Thanks.