trigger RequestTrigger on Request__c (after insert) {

   ID ATOP_ID = [select id from recordtype where Name = 'ATOP' and SobjectType = 'Request__c'].id;
   ID AIA_ID = [select id from recordtype where Name = 'AIA' and SobjectType = 'Request__c'].id;

   //set<ID> ATOP_OppIDs = new set<ID>();
   //set<ID> AIA_OppIDs = new set<ID>();
   set<ID> ATOP_IDs = new set<ID>();
   set<ID> AIA_IDs = new set<ID>();

   If (trigger.isAfter && trigger.isInsert) {

      for (Request__c r : trigger.new) {
         //If (r.RecordTypeId == ATOP_ID) ATOP_OppIDs.add(r.Opportunity__c);
         //If (r.RecordTypeId == AIA_ID) AIA_OppIDs.add(r.Opportunity__c);
       If (r.RecordTypeId == ATOP_ID) ATOP_IDs.add(r.Account__c);
         If (r.RecordTypeId == AIA_ID) AIA_IDs.add(r.Account__c);
      }


   //Opportunity[] opp1 = [select accountid from opportunity where id in :ATOP_OppIDs];
   //for (Opportunity o : opp1) {ATOP_IDs.add(o.accountid);}

   //Opportunity[] opp2 = [select accountid from opportunity where id in :AIA_OppIDs];
   //for (Opportunity o : opp2) {AIA_IDs.add(o.accountid);}

   system.debug('ATOP_IDs: ' + ATOP_IDs);
   system.debug('AIA_IDs: ' + AIA_IDs);

   Account[] acctsATOP = [select id, name, Last_ATOP_Request__c from account where id in :ATOP_IDs];

   for (Account a : acctsATOP) {a.Last_ATOP_Request__c = system.Date.today();}
   update acctsATOP;

   Account[] acctsAIA = [select id, name, Last_AIA_Request__c from account where id in :AIA_IDs];

   for (Account a : acctsAIA) {a.Last_AIA_Request__c = system.Date.today();}
   update acctsAIA;

   }
}