How Do I find the ID of the button that was clicked?

Question

I have a table with several rows. The last cell in each row has a button with the text of 'Edit'. Each button has an id of btnEditLevel+N. The N is an incremental identifer. I want to know which button was clicked so I can change the backcolor of the row that holds the cell that holds the button that was clicked. I can use Request.Form[] but all I get is the button text, not the button ID.