function open_download_window(url) {
	window.open(url, "download", 'left=50,top=50,width=500,height=200,toolbar=0,menubar=0,status=0,scrollbars=1,resizable=1,location=0,directories=0');
}

function open_window(url, left, top, width, height) {
	if (screen.width - left - width < 10) {
		left = Math.floor((screen.width - width - 10) / 2);
		if (left < 0) { left = 0; }
	}
	if (screen.width - left - width < 10) {
		width = screen.width - 10;
	}
	
	if (screen.height - top - height < 20) {
		top = Math.floor((screen.height - height -20) /2);
		if (top < 0) { top = 0; }
	}
	if (screen.height - top - height < 20) {
		height = screen.height - 20;
	}

	window.open(url, "capture", 'left='+left+',top='+top+',width='+width+',height='+height+',toolbar=0,menubar=0,status=0,scrollbars=1,resizable=1,location=0,directories=0');
}