function leavemplus(param1, langcode) {
    if ((null==langcode) || undefined==langcode)
      langcode = "us";
    var trackingImg = "http://www.nlm.nih.gov.libproxy.lib.unc.edu/results/medlineplus/" + langcode + "/leavemplus.html?";
    var img = document.createElement("img");
    img.setAttribute("src",trackingImg + param1);
}