function popup(b,h,page,navn){
	LeftPosition=(screen.width)?(screen.width-b)/2 :100;
	TopPosition=(screen.height)?(screen.height-h)/2 :100;
	settings="width="+ b +",height="+ h +",top="+TopPosition+",left="+LeftPosition+",scrollbars=no,location=no,directories=no,status=no,menubar=no,toolbar=no,resizable=no";
	popupWindow = window.open(page,navn,settings);
}