Not through html and xml no, html is just for structure of a webpage and xml is just for storing infomation and presenting it to the user.
If you don't have any server side scripting then yes, use javascript, I'm not quite sure of the apropriate function, google ought to find it for you.
Disclaimer. (1) Whilst I will help you sometimes, if I feel like it, and my advice in relation to your actual question will be of good quality: my posts are to be taken with a pinch of salt. I will be sarcastic, deploy irony and include obscure cultural references for my own amusement without warning.
(2) You will gain nothing from complaining, and if you try to argue with me then you will not win. No matter how noble your battle seems, I am still better than you, don't be an hero.
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