// JavaScript Document
var win = null; 
function popupwindow(filename, windowname, w, h) { 
var winl = (screen.width-w)/2; 
var wint = (screen.height-h)/2; 
if (winl < 0) winl = 0; 
if (wint < 0) wint = 0; 
var settings = 'height=' + h + ','; 
settings += 'width=' + w + ','; 
settings += 'top=' + wint + ','; 
settings += 'left=' + winl + ','; 
settings += 'resizable=0, scrollbars=0, status=0,toolbar=0, menubars=0, location=0'; 
win = window.open('./'+filename, windowname, settings); 
win.window.focus(); 
}