var dw_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 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 Tooltip = {
    followMouse: true,
    overlaySelects: true,  // iframe shim for select lists (ie win)
    offX: 8,
    offY: 12,
    showDelay: 100,
    hideDelay: 200,
    tipID: "tipDiv",
    ovTimer: 0,
    ready: false,
    timer: null,
    tip: null,
    shim: null,
    supportsOverlay: false,
    init: function() {
        if (document.createElement && document.body && typeof document.body.appendChild != "undefined") {
            var el = document.createElement("DIV");
            el.id = this.tipID;
            document.body.appendChild(el);
            this.supportsOverlay = this.checkOverlaySupport();
            this.ready = true;
        }
    },
    show: function(e, msg) {
        if (this.timer) {
            clearTimeout(this.timer);
            this.timer = 0;
        }
        if (!this.ready)
            return;

        this.tip = document.getElementById(this.tipID);
        if (this.followMouse)
            dw_event.add(document, "mousemove", this.trackMouse, true);

        this.writeTip("");
        this.writeTip(msg);
        viewport.getAll();
        this.handleOverlay(1, this.showDelay);
        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;
    },
    hide: function() {
        if (this.timer) {
            clearTimeout(this.timer);
            this.timer = 0;
        }

        this.handleOverlay(0, this.hideDelay);
        this.timer = setTimeout("Tooltip.toggleVis('" + this.tipID + "', 'hidden')", this.hideDelay);
        if (this.followMouse)
            dw_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;
    }
};
	
	Tooltip.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";
		}
		
		this.positionOverlay();
	};
		
	Tooltip.trackMouse=function(e)
	{
		e=dw_event.DOMit(e);
		//e = null;
		Tooltip.positionTip(e);
	};
	
	Tooltip.checkOverlaySupport=function()
	{
		if(navigator.userAgent.indexOf("Windows")!=-1&&typeof document.body!="undefined"&&typeof document.body.insertAdjacentHTML!="undefined"&&!window.opera&&navigator.appVersion.indexOf("MSIE 5.0")==-1)
			return true;
		else 
			return false;
	};
		
	Tooltip.handleOverlay=function(bVis,d)
	{
		if(this.overlaySelects&&this.supportsOverlay)
		{
			if(this.ovTimer)
			{
				clearTimeout(this.ovTimer);
				this.ovTimer=0;
			}
			
			switch(bVis)
			{
				case 1:
					if(!document.getElementById('tipShim'))
						document.body.insertAdjacentHTML("beforeEnd",'<iframe id="tipShim" src="dummy.htm" style="position:absolute; left:0; top:0; z-index:500; visibility:hidden" scrolling="no" frameborder="0"></iframe>');
						this.shim=document.getElementById('tipShim');
						if(this.shim&&this.tip)
						{
							this.shim.style.width=this.tip.offsetWidth+"px";
							this.shim.style.height=this.tip.offsetHeight+"px";
						}
						
						this.ovTimer=setTimeout("Tooltip.toggleVis('tipShim', 'visible')",d);
						break;
						
				case 0:
					this.ovTimer=setTimeout("Tooltip.toggleVis('tipShim', 'hidden')",d);
					if(this.shim)
						this.shim=null;
						
					break;
			}
		}
	};
	
	Tooltip.positionOverlay=function()
	{
		if(this.overlaySelects&&this.supportsOverlay&&this.shim)
		{
			this.shim.style.left=this.tip.style.left;
			this.shim.style.top=this.tip.style.top;
		}
	};

	Tooltip.init();