function popupWin(theURL,winName,winW,winH) {
	var x_coord = (screen.width - winW) / 2;
	var y_coord = (screen.height - winH) / 2;
	var winProps = "height="+winH+",width="+winW+",scrollbars=yes,resizable=yes,status=yes";
  Win = window.open(theURL,winName,winProps);
	Win.window.moveTo(x_coord, y_coord);
	if (parseInt(navigator.appVersion) >= 4) { 
		Win.window.focus(); 
	}
}