[OpenLayers-Users] How to refresh a layer every N seconds?

[geekjack]

As the title said,I want one of the layers refreshed every N seconds,I have
find some useful articles like that: 
http://dev.openlayers.org/apidocs/files/OpenLayers/Strategy/Refresh-js.html   
and   http://trac.openlayers.org/ticket/2317. But i just cannot understand
it well .Could someone post some examples and some comments in the code
would be better i think. thank you !!
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