function popup(mypage,myname,w,h,features) {
	var win = null;
	
	//alert(features)
	var winl = (screen.width-w)/2;
	var wint = (screen.height-h)/2;
	if (winl < 0) winl = 0;
	if (wint < 0) wint = 0;
	
	if (features == true) {
		features = "toolbar,menubar,scrollbars,resizable,location"
		wint = wint-100;
	}
	var settings = 'height=' + h + ',';
	settings += 'width=' + w + ',';
	settings += 'top=' + wint + ',';
	settings += 'left=' + winl + ',';
	settings += features;
	win = window.open(mypage,myname,settings);
	win.window.focus();
}