var winWidth = 700;
var winHeight = 480;

function popFolder () {
	par = "left=" + Math.floor((screen.width-winWidth)/2) + ",width=" + winWidth;
	par += ",top=" + Math.floor((screen.height-winHeight)/2) + ",height=" + winHeight;
	par += ",scrollbars=yes,resizable=no";
	window.open ("winFldr.php", "Folder", par);
}