function popup(url, target, width, height) {
  var posX  = (screen.availWidth-width)/2;
  var posY  = (screen.availHeight-height)/2;
  var popup = window.open(url,target,'width='+width+',height='+height+',left='+posX+',top='+posY+',scrollbars=1,resizable=0,fullscreen=0');
  popup.focus();
}

function articlePrintPopup(articleId) {
  popup('/article_print/' + articleId + '/','article_print',620,600);
}

function wishlistPrintPopup() {
  popup('/wishlist_print/','wishlist_print',620,600);
}