it's about cross-site scripting at MSIEv6 client side using % encoding, but not the same as the one by PeaceFire.org which doesn't work on my PC. [tested]MSIEv6(CN version) {IEXPLORE.EXE file version: 6.0.2600.0000} {MSHTML.DLL file version: 6.00.2600.0000} [demo] at http://www16.brinkster.com/liudieyu/2FforMSIE/2FforMSIE-MyPage.htm or clik.to/liudieyu ==> 2FforMSIE-MyPage section. [exp] %?? in URL is decoded when IE caculates the domain, but not decoded while downloading a page. so [CODE.URL]http://www.yahoo.com%2F@clik.to/liudieyu ( 2F=hex$(asc('/')) ) leads to clik.to/liudieyu instead of www.yahoo.com, and the domain of it www.yahoo.com for IE Very simple, that's all. [contact] liudieyuinchina@yahoo.com.cn