var TopMenu = new Array(
 ["Home", "index"],
 ["How Time Works", "timeworks"],
 ["Why Tri-space?", "whytri"],
 ["Free Articles", "freebies"],
 ["Guestbook", "guestbook"],
 ["Responses", "responses"]
 );
var LowMenu = new Array(
 ["Home", "index"],
 ["Beyond Einstein", "beyondeinstein"],
 ["Metrical Structure", "metricalstructure"],
 ["Particles & Matter", "particlesmatter"],
 ["Collective Properties", "collectiveproperties"],
 ["Products", "products"]
 );
function GetMenu() {
    var url = document.URL.toLowerCase().replace(/\\/g, '/');
    document.write("<ul>");
    if (url.indexOf("/introductory/") + url.indexOf("/student/") + url.indexOf("/professional/") == -3)
        for (i = 0; i < TopMenu.length; i++)
            if (url.substring(url.lastIndexOf('/') + 1, url.lastIndexOf('.')) == TopMenu[i][1].toString().toLowerCase())
                document.write("<li><a class=\"section fw-current-nav-link\" href=\"#\">" + TopMenu[i][0] + "</a></li>");
            else
                document.write("<li><a class=\"section\" href=\"" + TopMenu[i][1] + ".htm\">" + TopMenu[i][0] + "</a></li>");
    else {
        var abbr = "";
        for (i = 0; i < TopMenu.length; i++)
            document.write("<li><a class=\"section\" href=\"../" + TopMenu[i][1] + ".htm\">" + TopMenu[i][0] + "</a></li>");
        if (url.indexOf("/introductory/") != -1) {
            document.write("<li>&nbsp;</li><li>Introductory level:</li>");
            abbr = "Intro.";
        }
        else if (url.indexOf("/student/") != -1) {
            document.write("<li>&nbsp;</li><li>Student level:</li>");
            abbr = "Student";
        }
        else {
            document.write("<li>&nbsp;</li><li>Professional level:</li>");
            abbr = "Profes.";
        }
        LowMenu[0][0] = abbr + " " + LowMenu[0][0];
        for (i = 0; i < LowMenu.length; i++)
            if (url.substring(url.lastIndexOf('/') + 1, url.lastIndexOf('.')) == LowMenu[i][1].toString().toLowerCase())
                document.write("<li>&nbsp &nbsp<a class=\"section fw-current-nav-link\"  href=\"#\">" + LowMenu[i][0] + "</a></li>");
            else
                document.write("<li>&nbsp &nbsp<a class=\"section\" href=\"" + LowMenu[i][1] + ".htm\">" + LowMenu[i][0] + "</a></li>");
    }
    document.write("</ul>");
}
function CheckForm()
{ var mail = document.getElementById('mail').value.toString();
  if (document.getElementById('name').value.toString().length > 0 && mail.length > 0 && mail.indexOf('@') > -1 && document.getElementById('msg').value.toString().length > 0)
    document.getElementById('sub').disabled = '';
  else
    document.getElementById('sub').disabled = 'disabled';
}

function CheckPage(name) {
  if (name.indexOf("0") == 6 && document.getElementById(name).checked) { 
    document.getElementById("1D").disabled = '';
    try {
      document.getElementById("1P").disabled = '';
      document.getElementById("2P").disabled = '';
    }
    catch (e) { }
    //if (document.getElementById("condit3").checked) { document.getElementById("3P").disabled = ''; }
  }
  else if (name.indexOf("0") == 6) {
    document.getElementById("1D").disabled = 'disabled';
    try {
      document.getElementById("1P").disabled = 'disabled';
      document.getElementById("2P").disabled = 'disabled';
    }
    catch (e) { }
    //document.getElementById("3P").disabled = 'disabled';
  }
  else if (name == "free" && document.getElementById(name).checked) {
    document.getElementById("1P").href = "articles/ItsAboutTime.pdf";
    document.getElementById("1P").target = "_blank";
    document.getElementById("1D").href = "articles/ItsAboutTime.doc";
    document.getElementById("1D").target = "_blank";
  }
  else if (name == "free") {
    document.getElementById("1P").href = "#";
    document.getElementById("1P").target = "_self";
    document.getElementById("1D").href = "#";
    document.getElementById("1D").target = "_self";
  }
  //else if (name.indexOf("3") == 6 && document.getElementById(name).checked && document.getElementById("condit0").checked)
  //{ document.getElementById("3P").disabled = ''; }
  //else if (name.indexOf("3") == 6)
  //{ document.getElementById("3P").disabled = 'disabled'; }
}

function GetCount(id) {
	if (document.getElementById('free').checked)
	    document.getElementById(id).src = 'http://counters.freewebs.com/Members/Counters/counter.jsp?userid=22223837&name=' + id + '&time=' + new Date().getTime();
}
function ShowHide(id, displaytype) {
    if (document.getElementById(id).style.display == 'none')
        document.getElementById(id).style.display = displaytype;
    else
        document.getElementById(id).style.display = 'none';
}