changing.restartDelay = 500; // delay onmouseout before call to rotate
changing.col = []; 
function SwapImage()
{
   var doc=document, args=arguments;
   doc.$imgSwaps = new Array();
   for(var i=2; i<args.length; i+=2)
   {
      var elem=FindObject(args[i]);
      if(elem)
      {
         doc.$imgSwaps[doc.$imgSwaps.length]=elem;
         elem.$src=elem.src;
         elem.src=args[i+1];
      }
   }
}
function FindObject(id, doc)
{
   var child, elem;
   if(!doc)
      doc=document;
   if(doc.getElementById)
      elem=doc.getElementById(id);
   else
   if(doc.layers)
      child=doc.layers;
   else
   if(doc.all)
      elem=doc.all[id];
   if(elem)
      return elem;
   if(doc.id==id || doc.name==id)
      return doc;
   if(doc.childNodes)
      child=doc.childNodes;
   if(child)
   {
      for(var i=0; i<child.length; i++)
      {
         elem=FindObject(id,child[i]);
         if(elem)
            return elem;
      }
   }
   var frm=doc.forms;
   if(frm)
   {
      for(var i=0; i<frm.length; i++)
      {
         var elems=frm[i].elements;
         for(var j=0; j<elems.length; j++)
         {
            elem=FindObject(id,elems[i]);
            if(elem) return elem;
         }
      }
   }
   return null;
}
// arguments: image name, rotation speed, path to images (optional), 
// target, i.e. name of window to direct url's to onclick (optional)
function changing(name, speed, path, tgt) {
    this.name = name; this.speed = speed || 4500; // default speed of rotation
    this.path = path || ""; this.tgt = tgt;
    this.ctr = 0; this.timer = 0; this.imgs = []; this.actions = [];
    this.index = changing.col.length; changing.col[this.index] = this;
    this.animString = "changing.col[" + this.index + "]";
}

changing.prototype.addImages = function() { // preloads images
    var img;
    for (var i=0; arguments[i]; i++) {
        img = new Image();
        img.src = this.path + arguments[i];
        this.imgs[this.imgs.length] = img;
    }
}

changing.prototype.addActions = function() {
    var len = arguments.length; // in case an argument's value is null
    for (var i=0; i < len; i++) 
        this.actions[this.actions.length] = arguments[i]; 
}

changing.prototype.rotate = function() {
    clearTimeout(this.timer); this.timer = null;
    if (this.ctr < this.imgs.length-1) this.ctr++;
    else this.ctr = 0;
    var imgObj = document.images[this.name];    
    if (imgObj) {
        imgObj.src = this.imgs[this.ctr].src;
        this.timer = setTimeout( this.animString + ".rotate()", this.speed);
    }
}

// Start rotation for all instances 
changing.start = function() {
    var len = changing.col.length, obj;
    for (var i=0; i<len; i++) {
        obj = changing.col[i];
        if (obj && obj.name ) // check for empty instance created by dw_random.js
            obj.timer = setTimeout( obj.animString + ".rotate()", obj.speed);
    }
}

// called onclick of images
changing.doClick = function(n) {
    var obj = changing.col[n]; 
	if ( !document.images || !obj ) return true;
    if ( obj.actions && obj.actions[obj.ctr] ) {
        if ( typeof obj.actions[obj.ctr] == "string" ) { // url
            if ( obj.tgt ) { // open in separate window
                // add features here if you want, i.e., chrome, size, position, ...
                var win = window.open(obj.actions[obj.ctr], obj.tgt);
                if ( win && !win.closed ) win.focus();
            } else {
                window.location = obj.actions[obj.ctr];
            }
        } else { // function pointer 
            obj.actions[obj.ctr](); // execute function
        }
    }
    return false;
}

// for stopping/starting onmouseover/out
changing.pause = function(n) {	
    changing.clearTimers(n);
}

changing.clearTimers = function(n) {
    var obj = changing.col[n]; 
    if ( obj ) {
        clearTimeout( obj.timer ); obj.timer = null;
    }
}

changing.resume = function(n) {
    changing.clearTimers(n);
    var obj = changing.col[n]; 
    if ( obj ) {
        obj.timer = setTimeout( obj.animString + ".rotate()", changing.restartDelay );
    }
}