window.onerror = function (err, file, line) {
	//can be set to alert,hide or default (empty string)
	var errors = "alert";  
	//remove alert here and you remove the error from showing on the page after testing it
	//hide will hide it entirely.  remove alert sends default which will show the error in error handler
	switch(errors)
	{
		case "alert":
			alert('JavaScript Error: ' + err + '\n' +
			'In file: ' + file + '\n' +
			'At line: ' + line);
			return true;
			break;
		case "hide":
			return true;
			break;		
		default:
			return false; //default handler
	}
}