var banner_win = null;
var banner_win_x = 0;
var banner_win_y = 0;

function buyBanner()
	{
	width = 540;
	height = screen.height/2;
	banner_win_x = (screen.width-width)/2;
	banner_win_y = (screen.height-height)/2;
	if (banner_win == null || banner_win.closed == true) {
		banner_win = window.open('/ccard/contratto.php', 'banner_win', 'scrollbars=yes,status=yes,location=no,hotkeys=no,resizeable=no,width=' + width + ',height=' + height);
		}
	
	setTimeout("moveBanner()", 500);
	}

function moveBanner()
	{
	if (banner_win == null || banner_win.closed == true) {
		buyBanner();
		}
	else {
		banner_win.window.moveTo(banner_win_x, banner_win_y);
		banner_win.window.focus();
		}
	}