var viewport = {
  getWinWidth: function () {
    this.width = 0;
    if (window.innerWidth) this.width = window.innerWidth - 18;
    else if (document.documentElement && document.documentElement.clientWidth)
  		this.width = document.documentElement.clientWidth;
    else if (document.body && document.body.clientWidth)
  		this.width = document.body.clientWidth;
  },

  getWinHeight: function () {
    this.height = 0;
    if (window.innerHeight) this.height = window.innerHeight - 18;
  	else if (document.documentElement && document.documentElement.clientHeight)
  		this.height = document.documentElement.clientHeight;
  	else if (document.body && document.body.clientHeight)
  		this.height = document.body.clientHeight;
  },

  getScrollX: function () {
    this.scrollX = 0;
  	if (typeof window.pageXOffset == "number") this.scrollX = window.pageXOffset;
  	else if (document.documentElement && document.documentElement.scrollLeft)
  		this.scrollX = document.documentElement.scrollLeft;
  	else if (document.body && document.body.scrollLeft)
  		this.scrollX = document.body.scrollLeft;
  	else if (window.scrollX) this.scrollX = window.scrollX;
  },

  getScrollY: function () {
    this.scrollY = 0;
    if (typeof window.pageYOffset == "number") this.scrollY = window.pageYOffset;
    else if (document.documentElement && document.documentElement.scrollTop)
  		this.scrollY = document.documentElement.scrollTop;
  	else if (document.body && document.body.scrollTop)
  		this.scrollY = document.body.scrollTop;
  	else if (window.scrollY) this.scrollY = window.scrollY;
  },

  getAll: function () {
    this.getWinWidth(); this.getWinHeight();
    this.getScrollX();  this.getScrollY();
  }
}

var rah_event = {
  add: function(obj, etype, fp, cap) {
    cap = cap || false;
    if (obj.addEventListener) obj.addEventListener(etype, fp, cap);
    else if (obj.attachEvent) obj.attachEvent("on" + etype, fp);
  },

  remove: function(obj, etype, fp, cap) {
    cap = cap || false;
    if (obj.removeEventListener) obj.removeEventListener(etype, fp, cap);
    else if (obj.detachEvent) obj.detachEvent("on" + etype, fp);
  },

  DOMit: function(e) {
    e = e? e: window.event;
    e.tgt = e.srcElement? e.srcElement: e.target;

    if (!e.preventDefault) e.preventDefault = function () { return false; }
    if (!e.stopPropagation) e.stopPropagation = function () { if (window.event) window.event.cancelBubble = true; }

    return e;
  }
}

var Tooltip = {
    followMouse: true,
    offX: 8,
    offY: 12,
    tipID: "tipDiv",
    showDelay: 100,
    hideDelay: 200,
    ready:false,
    timer:null,
    tip:null,
    init:function(){
        if(document.createElement&&document.body&&typeof document.body.appendChild!="undefined"){
            if(!document.getElementById(this.tipID)){
                var el=document.createElement("DIV");
                el.id=this.tipID;
                document.body.appendChild(el);
            }
            this.ready=true;
        }
    },
    show:function(e,msg){
        if(this.timer){
            clearTimeout(this.timer);
            this.timer=0;
        }
        this.tip=document.getElementById(this.tipID);
        if(this.followMouse)rah_event.add(document,"mousemove",this.trackMouse,true);
        this.writeTip("");
        this.writeTip(msg);
        viewport.getAll();
        this.positionTip(e);
        this.timer=setTimeout("Tooltip.toggleVis('"+this.tipID+"', 'visible')",this.showDelay);
    },
    writeTip:function(msg){
        if(this.tip&&typeof this.tip.innerHTML!="undefined")this.tip.innerHTML=msg;
    },
    positionTip:function(e){
        if(this.tip&&this.tip.style){
            var x=e.pageX?e.pageX:e.clientX+viewport.scrollX;
            var y=e.pageY?e.pageY:e.clientY+viewport.scrollY;
            if(x+this.tip.offsetWidth+this.offX>viewport.width+viewport.scrollX){
                x=x-this.tip.offsetWidth-this.offX;
                if(x<0)x=0;
            }else x=x+this.offX;
            if(y+this.tip.offsetHeight+this.offY>viewport.height+viewport.scrollY){
                y=y-this.tip.offsetHeight-this.offY;
                if(y<viewport.scrollY)y=viewport.height+viewport.scrollY-this.tip.offsetHeight;
            }else y=y+this.offY;this.tip.style.left=x+"px";
            this.tip.style.top=y+"px";
        }
    },
    hide:function(){
        if(this.timer){
            clearTimeout(this.timer);
            this.timer=0;
        }
        this.timer=setTimeout("Tooltip.toggleVis('"+this.tipID+"', 'hidden')",this.hideDelay);
        if(this.followMouse)rah_event.remove(document,"mousemove",this.trackMouse,true);
        this.tip=null;
    },
    toggleVis:function(id,vis){
        var el=document.getElementById(id);
        if(el)el.style.visibility=vis;
    },
    trackMouse:function(e){
        e=rah_event.DOMit(e);
        Tooltip.positionTip(e);
    }
};




function doTooltip(e, msg) {
  if ( typeof Tooltip == "undefined" || !Tooltip.ready ) return;
  Tooltip.show(e, msg);
}
function hideTip() {
  if ( typeof Tooltip == "undefined" || !Tooltip.ready ) return;
  Tooltip.hide();
}