Yep, definatly get it checked mate. although the only way to check it, is to open up the whole thing, and by that point, you might aswell change it lol
good luck
got a bit worried after seeing this so i checked mine out and though it is not as bad as yours there is a fair bit of damage to it, so i am planning to change it this weekend, did you have to remove the radiator? and wat parts would you recomend changing, ie tensioner idler and belt or should i just do the tensioner and belt? thanks craig