$(document).ready(function() {
  $("#col0 a.popup").click(function(e) {
    if (e.shiftKey || e.altKey || e.ctrlKey || e.metaKey) return true;
    var left = (document.body.clientWidth - 600) / 2;
    var top = (document.body.clientHeight - 500) / 2;
    return window.open(this.href, "_blank", "width=600,height=500,scrollbars=yes,left=" + left + ",top=" + top) == null;
  });
});