var i = 0;

function NewWindow(url, title, w, h, scroll, pos){
	
	var left = (screen.width)?(screen.width-w)/2:100;
	var top = (screen.height)?(screen.height-h)/2:100;
	
	opts = 'width=' + 420 + ', height=' + 520 + ', top=' + top + ', left=' + left +', scrollbars=' + scroll + ', location = no, directories = no, status = no, toolbar = no, resizable = no';
	window.open(url, i, opts);
	
	i++
	
}