I have a gas water heater and the pilot light keeps going out. It has an electric igniter, and when I click on it - it sparks. What could the problem be?

" I click on it " is this a piezo ignitor? Maverick BL-02 Piezo Igniter (http://www.google.com/products/catalog?hl=en&sugexp=ldymls&xhr=t&cp=13&qe=cGV6ZW8gaWduaXRvcg&qesig=ziUfJIUTQFSOJBcsAtnq7w&pkc=AFgZ2tm-1RWi-nGOZg-Iq2qbsyI6lWqR8G-n0URg_lwJRHYiJTEq0fwXmgRd8GleUDp1Tpe0UDvc9FKEpTFec 1C2XKQdZBzpHw&bav=on.2,or.r_gc.r_pw.&wrapid=tljp1300819902494015&q=piezo+ignitor&um=1&ie=UTF-8&cid=7431182832597764728&sa=X&ei=1O-ITbr9J4XOhAeN75CkDg&sqi=2&ved=0CDwQ8wIwAg#) one that gets a single push to generate a spark or does it go click, click, click for as long as you hold it in?

Need more info. Does it stay lite for a while? What is the model number? There are a lot of different styles and it could be any number of problems.