/*************************************************************************
  This code is from Dynamic Web Coding at dyn-web.com
  Copyright 2002-5 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!
*************************************************************************/

/*
  dw_rolltip.js   version date: March 2005  
  requires dw_event.js and dw_viewport.js
  algorithm for time-based animation from youngpup.net
*/

var RollTip = {
    followMouse: true,
    offX: 12,
    offY: 12,
    // duration of clipping animation
    showAni: 300,
    hideAni: 200,
    ID: "rolltipDiv",
    ready:false, timer:null, tip:null, 
  
    init: function() {
        // op7.51 can do the clip 
        var opok = ( !window.opera || window.opera && opera.buildNumber && opera.buildNumber() > 3800 )? true: false;        
        if ( document.createElement && document.body && 
            typeof document.body.appendChild != "undefined" && opok ) {
        var el = document.createElement("DIV");
        el.id = this.ID; document.body.appendChild(el);
        this.showMult = el.offsetWidth/this.showAni/this.showAni;	
        this.hideMult = el.offsetWidth/this.hideAni/this.hideAni;	                
        el.style.clip = "rect(0, 0, 0, 0)";
        el.style.visibility = "visible";
        this.ready = true;
        }
    },

    reveal: function(msg, e) {
        if (this.timer) { clearTimeout(this.timer);	this.timer = 0; }
        if (!this.rtready) return;
        this.tip = document.getElementById( this.ID );
        this.writeTip(""); // for mac ie 
        this.writeTip(msg);
        viewport.getAll();
        this.w = this.tip.offsetWidth; this.h = this.tip.offsetHeight;
        this.startTime = (new Date()).getTime();
        this.positionTip(e);
        if (this.followMouse) // set up mousemove 
            dw_event.add( document, "mousemove", this.trackMouse, true );
        this.timer = setInterval("RollTip.rollOut()", 10);
    },
  
    rollOut: function() {
        var elapsed = (new Date()).getTime() - this.startTime;
        if (elapsed < this.showAni) {
            var cv = this.w - Math.round( Math.pow(this.showAni - elapsed, 2) * this.showMult );
            this.clipTo(0, cv, this.h, 0);
        } else {
            this.clipTo(0, this.w, this.h, 0);
            clearInterval(this.timer); this.timer = 0;
        }
    },
  
    conceal: function() {
        if (this.timer) { clearTimeout(this.timer);	this.timer = 0; }
        this.startTime = (new Date()).getTime();
        if (this.followMouse) // release mousemove
            dw_event.remove( document, "mousemove", this.trackMouse, true );
        this.timer = setInterval("RollTip.rollUp()", 10);
    },
  
    rollUp: function() {
        var elapsed = (new Date()).getTime() - this.startTime;
        if ( elapsed < this.hideAni ) {
            var cv = Math.round( Math.pow(this.hideAni - elapsed, 2) * this.hideMult );
            this.clipTo(0, cv, this.h, 0);
        } else {
            this.clipTo(0, 0, this.h, 0);
            clearInterval(this.timer); this.timer = 0;
            this.tip = null;
        }  
    },
  
    writeTip: function(msg) {
        if ( this.tip && typeof this.tip.innerHTML != "undefined" ) this.tip.innerHTML = msg;
    },
  
    clipTo: function(top, rt, btm, lft) {
        if (this.tip && this.tip.style) 
            this.tip.style.clip = "rect("+top+"px, "+rt+"px, "+btm+"px, "+lft+"px)";
    }
};
  
RollTip.positionTip = function(e) {
    // put e.pageX/Y first! (for Safari)
    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; // no good with roll-out if layer appears over link
    } 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";
};

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