function open_window(filename,cid,w,h,scrollbars) { 

	window.name = "main";

	var bredde = (self.screen.availWidth / 2) - ( w / 2 );
	var hoejde = (self.screen.availHeight / 2) - ( h / 2);

	window.popup = window.open(filename + cid ,'popup','toolbar=0,directories=0,status=1,border=0,location=0,menubar=0,resizable=0,scrollbars=' + scrollbars + ',width=' + w + ',height=' + h);
	
	window.popup.moveTo(bredde,hoejde);

	window.popup.focus();
}