I have limited apex knowledge and I'm trying to adapt this code to fit my custom objects.  It worked fine until I started plugging in my custom objects.  The original code is- http://visualforcemadeeasy.blogspot.com/2009/03/how-to-add-and-delete-row-in-datatable.html?showComment=1360345388003#c2926072741019740563

Here's what I have so far, but I keep getting "Save error: Variable does not exist: acct.id"  I tried a couple different things to fix this, but it doesn't seem to work.  Any ideas?

public class TimeOffAccountController {

/* I set the Time Off Account and Time Off Request Objects
here for use through out the code*/
public Time_Off_Account__c TOA { get; private set;}
public time_off_request__c[] requestItems { get; private set; }
private ApexPages.StandardController controller;

// constructor, loads the Time Off Account and
// any Requests associated with it

void requestItems(id id) {
TOA = [SELECT Id, Name, Account_type__c, Account_Balance__c, Accrual_Start__c, Accrued_Hours__c, Adjusted_Hours__c,
       Annual_Accrual_Rate__c, Annual_Maximum__c, Available_Balance__c, Daily_Accrual_Rate__c, Employee__c, First_Date_Current_Year__c,
       Hours_Pending__c, Hours_Used__c, Last_Date_Current_Year__c, Maximum_Deficit__c, Maximum_Hours__c,
       Number_of_Days_YTD__c, Other_Accrual_Start_Date__c, Rollover_Hours__c,
      (SELECT Id, Name, Status__c, Begin_Date__c, End_Date__c, Number_of_Days__c, Pending__c, Pending_Check__c,
      Pending_Text__c, Projected_Eligible_Days__c, Projected_Hours_Accrued__c, Total_Hours__c
      FROM pto_requests__r) FROM time_off_account__c
      where id = :id limit 1];
//Hook requestItems to the query above
 requestItems = TOA.time_off_request__c;
}

//Define the id
id accountid;

/* A List Method to delete the Requests assigned*/
public list<time_off_request__c> todelete = new list<time_off_request__c>();

public TimeOffAccountController (ApexPages.StandardController c)
{
/* this will kickoff you main page */
controller = c;
/* to get this current Time Off Account Id*/
accountid = c.getRecord().id;
/*kick off the init() function*/
init();
}
public TimeOffAccountController () {
accountid =
ApexPages.CurrentPage().getParameters().get('id');

init();

}

void init() {
/* load up Requests
basically we defined requestitems up on top, so
when the page loads then requestItems(accountId)
will go through the query and list out the
Requests assoicated with it */
requestItems(accountid);  
}

public PageReference save() {
try {
upsert requestItems;
if ( todelete.size() > 0 ) {           
delete todelete;   
}
requestItems(acct.id);
}
catch ( DmlException exc) {
      ApexPages.addMessages(exc);
      return null;
}
return null;
}


/* your Delete functionality*/
public PageReference del() {

string delname = ApexPages.CurrentPage().getParameters().get('delname');
system.assert( delname != null );
integer gone = -1;
integer i = 0; 

for ( i=0; i< requestItems.size(); i++ ) { 
if (requestItems[i].RequestNumber== delname) { 
gone = i;
} 
}
if ( gone >= 0) { 
todelete.add(requestItems.remove(gone) ); 
}
  
return null;
}

public PageReference add() {
// insert a new line, after user clicks Add
time_off_request__c tor =  new time_off_request__c(
AccountId = acct.id

);
requestItems.add ( tor );
return null;
 }
}