modifing xpath to find necessary element in it

Can you advise me, please, is there any way to modify the following xpath so that the only picture name us.gif can be found.

//img[co开发者_C百科ntains(@src,
               'http://cache.global.com/cache/1102A/images/flags/icon/us.gif')]

If you want to check whether an attribute holds exactly one constant value, you can do it this way:

//img[@src='us.gif']