function setvar(num,val) {
  num=parseInt(num);
  val=parseInt(val);
  walden_vars[num] = val;
}
function setMode(val) {
  walden_mode = val;
}
function removeBefore() {
  setvar(35,0);
  beforeStr = "";
  var ConstraintsDiv = document.getElementById("constraints");
  if (ConstraintsDiv != null) { ConstraintsDiv.innerHTML = ""; }
  var uns = walden_vars[33];
  show_only_unseen(0);
  if (uns) { show_only_unseen(1); }
}
function removeAfter() {
  setvar(34,0);
  afterStr = "";
  var ConstraintsDiv = document.getElementById("constraints");
  if (ConstraintsDiv != null) { ConstraintsDiv.innerHTML = ""; }
  var uns = walden_vars[33];
  show_only_unseen(0);
  if (uns) { show_only_unseen(0); }
}
function printConstraints() {
  var ConstraintsDiv = document.getElementById("constraints");
  if (ConstraintsDiv != null) {
    var theString = "<hr noshade size=\"1\">";
    if ((afterStr.length > 0) && (beforeStr.length > 0)) {
      theString += "Only selecting pages added after: "+afterStr;
      theString += " <a href=\"javascript:removeAfter()\">(REMOVE)</a><br>\n";
      theString += "And Before: "+beforeStr+" <a href=\""+
	"javascript:removeBefore()\">(REMOVE)</a><br>";
    } else if (afterStr.length > 0) {
      theString += "Only selecting pages added after: "+afterStr;
      theString += " <a href=\"javascript:removeAfter()\">(REMOVE)</a><br>\n";
    } else if (beforeStr.length > 0) {
      theString += "Only selecting pages added before: "+beforeStr;
      theString += " <a href=\"javascript:removeBefore()\">(REMOVE)</a><br>\n";
    }
    if (walden_vars[33]) {
      theString += "Only displaying pages you haven't already seen<br>\n";
    }
    ConstraintsDiv.innerHTML = theString;
  }
}
function setAfterDate(dateStr) {
  var NowDate = new Date();
  var ProposedDate = new Date(Date.parse(dateStr));
  // if now is < parsed date that's the future
  if (NowDate.getTime() < ProposedDate.getTime()) {
    alert("Cannot accept constraint - that date's in the future.");
    return;
  }
  // Can't have an after that's after the before
  if (beforeStr.length > 0) {
    var BeforeDate = new Date(Date.parse(beforeStr));
    if (BeforeDate.getTime() < ProposedDate.getTime()) {
      alert("You've already specified a constraint that conflicts. Cannot get dates after "+dateStr+
	    " and before "+beforeStr+" change the other constraint first");
      return;
    }
  }
  afterStr = dateStr;
  var dateAsSecs = (ProposedDate.getTime())/1000;
  setvar(34, dateAsSecs);
  printConstraints();
}
function setBeforeDate(dateStr) {
  var ProposedDate = new Date(Date.parse(dateStr));
  if (afterStr.length > 0) {
    var AfterDate = new Date(Date.parse(afterStr));
    if (ProposedDate.getTime() < AfterDate.getTime()) {
      alert("You've already specified a constraint that conflicts. Cannot get dates after "+afterStr+
	    " and before "+dateStr+" change the other constraint first");
      return;
    }
  }
  beforeStr = dateStr;
  var dateAsSecs = (ProposedDate.getTime())/1000;
  setvar(35, dateAsSecs);
  printConstraints();
}
function goToShowPath() {
  var newlocation = "showPath.php?";

  for (i = 0; i < walden_vars.length; i++) {
    if (walden_vars[i]) {
      newlocation += "walden_"+i+"="+walden_vars[i]+"&";
    }
  }
  newlocation = newlocation.substring(0, newlocation.length - 1);
  if (walden_mode.length) newlocation += "walden_mode="+walden_mode;
  if (walden_mode.length) newlocation += "walden_mode="+walden_mode;
  if (newlocation == "showPath.php") return;
  //    alert(newlocation);
  window.location = newlocation;
}
function get_terms() {
   var load = window.open('dynamic_path.php?walden_1='+walden_vars[1]+'&walden_5='+walden_vars[5]+'&walden_33='+walden_vars[33]+'&walden_34='+
			  walden_vars[34]+'&walden_35='+walden_vars[35],'','scrollbars=no,menubar=no,height=120,width=300,'+
			  'resizable=yes,toolbar=no,location=no,status=no');
}
function goToAlternatePathList() {
  var newlocation = "index.php?";
  if (!walden_vars[33]) {
    walden_vars[33]="0";
  }
  for (i = 0; i < walden_vars.length; i++) {
    if (walden_vars[i]) {
      newlocation += "walden_"+i+"="+walden_vars[i]+"&";
    }
  }
  newlocation = newlocation.substring(0, newlocation.length - 1);
  if (walden_mode.length) newlocation += "walden_mode="+walden_mode;
  if (walden_mode.length) newlocation += "walden_mode="+walden_mode;
  //  if (newlocation == "index.php") return;
  //  alert(newlocation);
  window.location = newlocation;
}
function printErrors() {
  var ConstraintsDiv = document.getElementById("constraints");
  if (ConstraintsDiv && ConstraintsDiv.innerHTML) {
    if (error_msg.length > 3) {
      var orig = ConstraintsDiv.innerHTML;
      ConstraintsDiv.innerHTML += "<font color=\"red\">ERROR: "+error_msg+"</font><br>";
    }
  }
}