/*************************************************************************
  dw_float.js
  float positioned objects up/down or left/right
  version date Nov 2003

  This code is from Dynamic Web Coding at http://www.dyn-web.com/
  Copyright 2003 by Sharon Paine 
  See Terms of Use at http://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 screenheight = screen.height;
factor = screenheight/2;
factor = factor - 285;
pos=0;
floatObject.holder = [];
// arguments: id, left, top, direction, speed (pixels per loop), delay for restart or null, optional end function
function floatObject(id,x,y,dir,sp,d,fn) {

  this.el = document.getElementById? document.getElementById(id): null;
  if (!this.el) return;

  var px = window.opera? 0: "px";
  this.id = id; this.xOff = x; this.yOff = y;
  this.el.style.left = x + px; this.el.style.top = y + px;
  this.el.style.visibility = "visible"; 
  this.speed = sp; this.ctr = 0; this.active = true;
  if (fn) this.onFloatEnd = fn; this.delay = d;
  if (!fn && !d) this.onFloatEnd = function() { this.el = null; this.active = false; };
  this.prop = (dir == "left" || dir == "right")? "left": "top";
  if (dir == "left" || dir == "up") this.speed = -sp;
  floatObject.holder[floatObject.holder.length] = this;
  if (!floatObject.Canvas.width || !floatObject.Canvas.height) floatObject.Canvas = floatObject.getDimensions();
}

floatObject.prototype.do_float = function() {
  var cur;
  switch (this.prop) {
    case "left":
      cur = parseInt( this.el.style.left );
      
      if ( ( this.speed > 0 && cur < floatObject.Canvas.width + this.el.offsetWidth ) 
          || ( this.speed < 0 && cur > -this.el.offsetWidth ) ) {
        this.el.style.left = parseInt(this.el.style.left) + this.speed + "px";
      } else {
        if (this.delay) this.hold_and_reset(this.xOff);
        this.onFloatEnd(this);
      }
    break;
    case "top":
      cur = parseInt( this.el.style.top );
     if(cur<=factor){
      if ( ( this.speed > 0 && cur < floatObject.Canvas.height + this.el.offsetHeight ) 
          || ( this.speed < 0 && cur > -this.el.offsetHeight ) ) {
        this.el.style.top = parseInt(this.el.style.top) + this.speed + "px";
      } else {
        if (this.delay) this.hold_and_reset(this.yOff);
        this.onFloatEnd(this);
      }
     } 
      
    break;
  }
}

floatObject.prototype.hold_and_reset = function(nOff) {
  if ( this.ctr < this.delay/floatObject.callRate ) {
    this.el.style.visibility = "hidden";
    this.ctr++;
  } else { 
    this.el.style[this.prop] = nOff + "px"; 
    this.el.style.visibility = "visible";
    this.ctr = 0; 
  }
}

floatObject.prototype.onFloatEnd = function(){
};

floatObject.callRate = 20;
floatObject.timer = window.setInterval("floatObject.control()", floatObject.callRate);
// Handle all instances with one timer - idea from youngpup.net
floatObject.control = function() {
  var i, curObj;
  for (i=0; curObj = floatObject.holder[i]; i++) 
    if ( curObj && curObj.active ) curObj.do_float();
}

floatObject.Canvas = {}; // See last line of constructor
// for obtaining largest of window and document width/height
floatObject.getDimensions = function() {
  var winWd=0, winHt=0, docWd=0, docHt=0;
  
  if (window.innerWidth) winWd = window.innerWidth - 18;
	else if (document.documentElement && document.documentElement.clientWidth) 
		winWd = document.documentElement.clientWidth;
	else if (document.body && document.body.clientWidth) 
		winWd = document.body.clientWidth;
    
  if (window.innerHeight) winHt = window.innerHeight - 18;
	else if (document.documentElement && document.documentElement.clientHeight) 
		winHt = document.documentElement.clientHeight;
	else if (document.body && document.body.clientHeight) 
		winHt = document.body.clientHeight;
    
  if (document.width) docWd = document.width;
  else if (document.body) 
    docWd = Math.max(document.body.scrollWidth, document.body.offsetWidth);
    
  if (document.height) docHt = document.height;
  else if (document.body) 
    docHt = Math.max(document.body.scrollHeight, document.body.offsetHeight);
    
  return {
    width:  Math.max(winWd, docWd),
    height: Math.max(winHt, docHt)
  }

}

if (window.addEventListener)
  window.addEventListener("resize", function(){ floatObject.Canvas = floatObject.getDimensions() }, "false");
else if (window.attachEvent)
  window.attachEvent("onresize", function(){ floatObject.Canvas = floatObject.getDimensions() } );