how to check weekend&holiday

[sela cullens]

hi,, I need help with javascript.
I have 1 form & 2 Text(startDate, endDate). The text will be use to check the date, if are have weekend or holiday or not..
if I input starDate="12/19/2009" & end Date="12/26/2009" ,if i have done input endDate, then system will be run if in that date have weekend and/ or holiday the result will explain which date are holiday and/or weekend. if dont have holiday or weekend the result : no weekend or holiday in that date.
so this process dont need click submit for run the process. this process will be take at onKeyUp.

please Help me.

[in2clearsky]

For weekend, you can use getDay() method of date object. 0 is Sun and 6 is Sat. See more detail here:
http://www.w3schools.com/jsref/jsref_getDay.asp

For holiday, i think you need holiday database as it vary from time to time.

[JavaScriptBank.com]

some holiday JavaScripts (http://www.google.com.vn/search?hl=vi&client=firefox-a&rls=org.mozilla%3Aen-US%3Aofficial&hs=ki4&q=holiday+site%3Ahttp%3A%2F%2Fwww.javascriptbank.com&btnG=T%C3%ACm+ki%E1%BA%BFm&meta=) maybe you need