function Open_window(urlstring)
{
	var url = urlstring
	var url_array = urlstring.split('://');
	if (url_array != null)
	{
		urlstring = url_array[1];
	}
	url_array = urlstring.split('/');
	
	if(document.location.href.indexOf(url_array[0] ) > 0)
	{
		document.location.href= url ;
	}
	else
	{
		window.open (url);
	}
}