var newWin

function launchPopupWindow(popup_url,popup_name,popup_width,popup_height,popup_scrollbars) {
	
	winTop = (screen.height-popup_height)/100;
	winLeft = (screen.width-popup_width)/100;

	newWin = window.open(popup_url,popup_name,'width=' + popup_width + ',height=' + popup_height + ',top=' + winTop + ',left=' + winLeft + ',scrollbars=' + popup_scrollbars + ',resizable=no,toolbar=no,location=no,directories=no,status=no,menubar=no,copyhistory=yes');

	newWin.focus();
}