// (c) 2007, Alberto Riva (ariva@ufl.edu)

// These two first variables can be 
// changed if desired. Everything
// else should be left alone.

var menubgcolor='white';  //menu bgcolor
var disappeardelay=400;  //menu disappear speed onMouseout (in miliseconds)

var menuwidth='165px'; //default menu width
var hidemenu_onclick="yes"; //hide menu when user clicks within menu?

var agt=navigator.userAgent.toLowerCase();
var saf = (agt.indexOf("safari") != -1);
var ie4 = document.all;
var ns6 = document.getElementById && !document.all;

if (ie4||ns6||saf)
  document.write('<div id="dropmenudiv" style="visibility:hidden;width:'+menuwidth+';background-color:'+menubgcolor+'" onMouseover="clearhidemenu()" onMouseout="dynamichide(event)"></div>');

function getposOffset(what, offsettype){
  var totaloffset = (offsettype=="left") ? what.offsetLeft : what.offsetTop;
  var parentEl=what.offsetParent;
  while (parentEl!=null) {
    totaloffset=(offsettype=="left") ? totaloffset+parentEl.offsetLeft : totaloffset+parentEl.offsetTop;
    parentEl=parentEl.offsetParent;
  }
  return totaloffset;
}

function showhide(obj, e, visible, hidden, menuwidth) {
  if (ie4||ns6||saf)
    dropmenuobj.style.left=dropmenuobj.style.top="-500px";
      if (menuwidth!="") {
	dropmenuobj.widthobj=dropmenuobj.style;
	dropmenuobj.widthobj.width=menuwidth;
      }
      if (e.type=="click" && obj.visibility==hidden || e.type=="mouseover")
	obj.visibility=visible;
      else if (e.type=="click")
	obj.visibility=hidden;
}

function iecompattest() {
  return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body;
}

function clearbrowseredge(obj, whichedge) {
  var edgeoffset=0;
  if (whichedge=="rightedge") {
    var windowedge=ie4 && !window.opera? iecompattest().scrollLeft+iecompattest().clientWidth-15 : window.pageXOffset+window.innerWidth-15;
    dropmenuobj.contentmeasure=dropmenuobj.offsetWidth;
    if (windowedge-dropmenuobj.x < dropmenuobj.contentmeasure)
      edgeoffset=dropmenuobj.contentmeasure-obj.offsetWidth;
  } else {
    var topedge=ie4 && !window.opera? iecompattest().scrollTop : window.pageYOffset;
    var windowedge=ie4 && !window.opera? iecompattest().scrollTop+iecompattest().clientHeight-15 : window.pageYOffset+window.innerHeight-18;
    dropmenuobj.contentmeasure=dropmenuobj.offsetHeight;
    if (windowedge-dropmenuobj.y < dropmenuobj.contentmeasure) { //move up?
      edgeoffset=dropmenuobj.contentmeasure+obj.offsetHeight;
      if ((dropmenuobj.y-topedge)<dropmenuobj.contentmeasure) //up no good either?
	edgeoffset=dropmenuobj.y+obj.offsetHeight-topedge;
    }
  }
  return edgeoffset;
}

function populatemenu(what) {
  if (ie4||ns6||saf)
    dropmenuobj.innerHTML=what.join("");
}

function arddmenu(obj, e, menucontents, menuwidth, offset) {
  if (window.event) event.cancelBubble=true;
  else if (e.stopPropagation) e.stopPropagation();
  clearhidemenu();
  dropmenuobj=document.getElementById? document.getElementById("dropmenudiv") : dropmenudiv;
  populatemenu(menucontents);

  if (ie4||ns6||saf) {
    showhide(dropmenuobj.style, e, "visible", "hidden", menuwidth);
    dropmenuobj.x=getposOffset(obj, "left") + offset;
    dropmenuobj.y=getposOffset(obj, "top");
    dropmenuobj.style.left=dropmenuobj.x-clearbrowseredge(obj, "rightedge")+"px";
    dropmenuobj.style.top=dropmenuobj.y-clearbrowseredge(obj, "bottomedge")+obj.offsetHeight+"px";
  }

  return clickreturnvalue();
}

function arddmenufix(obj, e, menucontents, menuwidth, menux, menuy) {
  if (window.event) event.cancelBubble=true;
  else if (e.stopPropagation) e.stopPropagation();
  clearhidemenu();
  dropmenuobj=document.getElementById? document.getElementById("dropmenudiv") : dropmenudiv;
  populatemenu(menucontents);

  if (ie4||ns6||saf) {
    showhide(dropmenuobj.style, e, "visible", "hidden", menuwidth);
    dropmenuobj.x=menux;
    dropmenuobj.y=menuy;
    dropmenuobj.style.left=dropmenuobj.x + "px";
    dropmenuobj.style.top=dropmenuobj.y + "px";
  }

  return clickreturnvalue();
}

function clickreturnvalue() {
  if (ie4||ns6||saf) return false;
  else return true;
}

function contains_ns6(a, b) {
  while (b.parentNode)
    if ((b = b.parentNode) == a)
      return true;
  return false;
}

function dynamichide(e) {
  if (ie4&&!dropmenuobj.contains(e.toElement))
    delayhidemenu();
  else if (ns6&&e.currentTarget!= e.relatedTarget&& !contains_ns6(e.currentTarget, e.relatedTarget))
    delayhidemenu();
}

function hidemenu(e) {
  if (typeof dropmenuobj!="undefined") {
    if (ie4||ns6||saf)
      dropmenuobj.style.visibility="hidden";
  }
}

function delayhidemenu() {
  if (ie4||ns6||saf)
    delayhide=setTimeout("hidemenu()",disappeardelay);
}

function clearhidemenu() {
  if (typeof delayhide!="undefined")
  clearTimeout(delayhide);
}

if (hidemenu_onclick=="yes")
  document.onclick=hidemenu;