Can anyone tell me how to write the trigger based on the approved records?   
My use case is  
I want to enter the records to queue if the record is approved by appropriate user.   
I need an idea for this use case


**Updated**    
Get the (custom object) record details in visualforce page and submit for the manager approval.    
once he approved then the record should be submitted to the queue.    
My question s how to write the trigger based on the approvals(Approved,reject and pending)    
In which obj approvals are stored..


Thanks in advance   
​Karthick