var params = '';
var type = 'centered';
var width  = 400;
var height = 300;
 
if (type == "fullscreen") {
	params  = 'width='+screen.width;
	params += ', height='+screen.height;
	params += ', top=0, left=0'
	params += ', fullscreen=yes';	
}
else if (type == "centered") {
	var left   = (screen.width  - width)/2;
	var topp    = (screen.height - height)/2;
	params = 'width='+width+', height='+height;
	params += ', top='+topp+', left='+left;
}
else {
	params = 'width='+width+', height='+height;
	params += ', top=50, left=50'
}

function showHelpWindow(url) {
//	alert (params);
	params += ', directories=no';
	params += ', location=no';
	params += ', menubar=no';
	params += ', resizable=no';
	params += ', scrollbars=yes';
	params += ', status=no';
	params += ', toolbar=no';	
	url = 'index.php?page=help&subject=' + url;
	newwin=window.open(url,'help', params);
	if (window.focus) {newwin.focus()}
	return false; 
}