rem: var qs = WebForm_getFormData (myForm) + "&__CALLBACKTARGET=" + id + "&&__CALLBACKARGUMENT=" + escape(arg); 
add: var qs = WebForm_getFormData (myForm) + "__CALLBACKTARGET=" + id + "&__CALLBACKARGUMENT=" + encodeURIComponent(arg); if (myForm["__EVENTVALIDATION"]) qs += "&__EVENTVALIDATION=" + encodeURIComponent(myForm["__EVENTVALIDATION"].value); 
context: function WebForm_DoCallback (id, arg, callback, ctx, errorCallback){	var myForm = WebForm_GetFormFromCtrl (id);	var qs = WebForm_getFormData (myForm) + "&__CALLBACKTARGET=" + id + "&&__CALLBACKARGUMENT=" + escape(arg);	// WebForm_httpPost (myForm.serverURL, qs, function (httpPost) { WebForm_ClientCallback (httpPost, ctx, callback, errorCallback); });	WebForm_httpPost (document.URL, qs, function (httpPost) { WebForm_ClientCallback (httpPost, ctx, callback, errorCallback); });}
meta: 172	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/172/18af3d73947ae39f750b13dd9220826463dfd911/webform.js/clean/mcs/class/System.Web/resources/webform.js