/*************************************************************************
  dw_tooltip.js   requires: dw_event.js and dw_viewport.js
  version date: May 21, 2005 moved init call to body onload
  (March 14, 2005: minor changes in position algorithm and timer mechanism)
  
  This code is from Dynamic Web Coding at dyn-web.com
  Copyright 2003-5 by Sharon Paine 
  See Terms of Use at www.dyn-web.com/bus/terms.html
  regarding conditions under which you may use this code.
  This notice must be retained in the code as is!
*************************************************************************/

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)
			dw_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)
	      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;
	},


    trackMouse: function(e) {
    	e = dw_event.DOMit(e);
     	Tooltip.positionTip(e);	
    }
};