jQuery(document).ready(function($) {
 $('.popup').click(function() {
  var width  = 575,
   height = 450,
   left   = ($(window).width()  - width)  / 2,
   top    = ($(window).height() - height) / 2,
   url    = this.href,
   opts   = 'status=1' +
   ',width='  + width  +
   ',height=' + height +
   ',top='    + top    +
   ',left='   + left;

  window.open(url, '_blank', opts);

  return false;
 });
});