function reportError(msg,url,line) {
var str = "JavaScript Error: " + msg + " on line: " 
+ line + "\n\nURL: " + url  + "\n\nWeb: " 
+ navigator.appName + " " + navigator.appName 
+ " " + navigator.appVersion;
window.alert(str);
return true;
}
window.onerror = reportError;