[xwiki-users] Strange ajax + json issue

Hello, This is for something I'm trying to develop ... And I'm not sure it has something to do with XWiki, but who knows ? In a page I call a particular init() function like this : Event.observe(window, "load", init); This init() aims at loading some JSON data from another page using Ajax. I was inspired by the livetable.js here :-) var json = "" var ajx=new Ajax.Request( " http://localhost:8081/xwiki/bin/view/Dev/JSONProvider?xpage=plain&outpu…ain", {method:"get", onSuccess:function(transport) { json = eval("("+transport.responseText+")"); } } ) This Javascript is in a .js file along with other resources on the server filesystem. It is loaded with $xwiki.jsfx.use(...) . When I debug step by step using Firebug, everything is fine, "json" variable contains what I expect. But when I'm not debugging and refresh the page, "json" variable is empty ... (breakpointing AFTER ajax call shows it). Though I can see in Firebug that my Ajax http request finished with a 200 OK code. Do you think it might be linked to the fact this method is called on page load ? I can't see how it's different than other ajax calls in xwiki ... Thanks for any help, Jeremie