Calling ASP.NET WebService from other domains with javaScript

Hi all,
I wanna create a panel like Amazon Add to wish list.
 it is like :

[img=http://img125.imageshack.us/img125/8866/addtowishlistjw6.jpg] [img=http://img125.imageshack.us/img125/addtowishlistjw6.jpg/1/w591.png]">


  So I have a page in my server as "getPageInfo.aspx&quo ...