Hi, 

I found that the javascript's operation of ajax may be error if  the client can't connect to the server.

To support the code stronger,this "try...catch" code should be add.

In the ig_shared.js(Version 7.3.20073.38) 

line:1306 

this code: 

this.execute = function ()
    {
        var exec = true;
        if(this.beforeCallback != null)
                exec = this.beforeCallback();
        if(exec && this._xmlHttpRequest)
        {

                if(this._progressIndicator != null)
                    this._progressIndicator.display();
                this.formatCallbackArguments();
                this.registerSmartCallback();
                this._xmlHttpRequest.open("POST", this.getUrl(), !this._waitResponse);
                this._xmlHttpRequest.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
                this._xmlHttpRequest.onreadystatechange = this._responseComplete;
                this._xmlHttpRequest.send(this.getCallbackArguments());
        }
    }

should be changed:

this.execute = function ()
    {
        var exec = true;
        if(this.beforeCallback != null)
                exec = this.beforeCallback();
        if(exec && this._xmlHttpRequest)
        {
            try                 // code add           

               {
                if(this._progressIndicator != null)
                    this._progressIndicator.display();
                this.formatCallbackArguments();
                this.registerSmartCallback();
                this._xmlHttpRequest.open("POST", this.getUrl(), !this._waitResponse);
                this._xmlHttpRequest.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
                this._xmlHttpRequest.onreadystatechange = this._responseComplete;
                this._xmlHttpRequest.send(this.getCallbackArguments());
            }catch(e){}         // code add        

}
    }

Thanks.