var lastFocusedControlId = "";
function focusHandler(e) {    
    document.activeElement = e.originalTarget;
}
function appInit() {    
    if (typeof(window.addEventListener) !== "undefined") {        
        window.addEventListener("focus", focusHandler, true);    
    }    
    Sys.WebForms.PageRequestManager.getInstance().add_pageLoading(pageLoadingHandler);    
    Sys.WebForms.PageRequestManager.getInstance().add_pageLoaded(pageLoadedHandler);
}
function pageLoadingHandler(sender, args) {    
    lastFocusedControlId = typeof(document.activeElement) === "undefined"         
        ? "" : document.activeElement.id;
}
function focusControl(targetControl) {    
    if (Sys.Browser.agent === Sys.Browser.InternetExplorer) {        
        var focusTarget = targetControl;        
        if (focusTarget && (typeof(focusTarget.contentEditable) !== "undefined")) {            
            oldContentEditableSetting = focusTarget.contentEditable;            
            focusTarget.contentEditable = false;        
        }        
        else {            
            focusTarget = null;        
        }        
        targetControl.focus();        
        if (focusTarget) {            
            focusTarget.contentEditable = oldContentEditableSetting;        
        }    
    }    
    else {        
        targetControl.focus();    
    }
}
function pageLoadedHandler(sender, args) {    
    if (typeof(lastFocusedControlId) !== "undefined" && lastFocusedControlId != "") {        
        var newFocused = $get(lastFocusedControlId);        
        if (newFocused) {            
            focusControl(newFocused);        
        }    
     }
}
Sys.Application.add_init(appInit);