I need help with javascript.

[Kalyan]

Hi there..

I need a javascript program to find the week number of the date given, in an year. I have googled and found a script. but that is having some bugs with some dates. (Eg: 31 st Dec 2009 is in 1st week of 2009 but it is giving the output as 53rd.)
Please.. if u could find a suggestion, please let me know.

[fun2sh]

wat are u takin dear
31st dec in first week