Sys.Application.add_init(addInit);
var control;
function addInit(sender) {
var instance = Sys.WebForms.PageRequestManager.getInstance();
instance.add_beginRequest(BeginRequest);
instance.add_endRequest(EndRequest);
}
function BeginRequest(sender, args) {
control = args.get_postBackElement();
reverseDisable(control);
}
function EndRequest(sender, args) {
reverseDisable(control);
}
function reverseDisable(c) {
c.disabled = !c.disabled;
}