How to... Automatically update a field in "Contacts" that i change or add in "Accounts"

Hi There

HELP ;_)

I have a field in ACCOUNTS called REPS that has drop down options (Global Drop down List)

I want to Update a field in CONTACT called REPS (Global Drop down List) automatically for all contacts associated to the Company in Accounts

I tried to copy a script and edit it but i ge an error

to be honest.... i have no idea what im trying will even work

Screen Shots below

Script:

// Fetch the Account details using the Account ID

accountDetails = zoho.crm.getRecordById("Accounts",accountId);

// Check if the required fields are present in the Account

if(accountDetails.get("Rep") != null)

{

rep = accountDetails.get("Rep");

// info rep;;

// Fetch related Contacts

relatedContacts = zoho.crm.searchRecords("Contacts","(Account_Name:equals:" + accountId + ")");

// info relatedContacts;

for each contact in relatedContacts

{

// Update the Contact fields

contactId = contact.get("id");

// info contactId;

updateMap = Map();

if(rep != null)

{

updateMap.put("Rep",rep);

}

// info updateMap;

updateResponse = zoho.crm.updateRecord("Rep",contactId,updateMap);

info updateResponse;

}