// Popup Window
// input:  (URL, window name, height, width, centred?)
// output: redirection to Confirmation-URL or Cancel-URL

function popup (my_url, my_name, my_width, my_hight)
{
	TopPosition = 0;
	LeftPosition = 0;
	
	LeftPosition = (screen.width) ? (screen.width-my_width)/2 : 0;
	TopPosition = (screen.height) ? (screen.height-my_hight)/2 : 0;
	
	my_settings = 'width='+my_width+',height='+my_hight+',top='+TopPosition+',left='+LeftPosition+',scrollbars=yes,menubar=yes,resizable'

	Fenster = window.open(my_url, my_name, my_settings);
}