/*  dw_rotator.js  JavaScript rotate images code  version date: April 2005  */



/*************************************************************************

    This code is from Dynamic Web Coding at dyn-web.com

    Copyright 2001-5 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_Rotator.restartDelay = 500; // delay onmouseout before call to rotate

dw_Rotator.col = []; 



// arguments: image name, rotation speed, path to images (optional), 

// target, i.e. name of window to direct url's to onclick (optional)

function dw_Rotator(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 = dw_Rotator.col.length; dw_Rotator.col[this.index] = this;

    this.animString = "dw_Rotator.col[" + this.index + "]";

}



dw_Rotator.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;

    }

}



dw_Rotator.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]; 

}



dw_Rotator.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 

dw_Rotator.start = function() {

    var len = dw_Rotator.col.length, obj;

    for (var i=0; i<len; i++) {

        obj = dw_Rotator.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

dw_Rotator.doClick = function(n) {

    var obj = dw_Rotator.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

dw_Rotator.pause = function(n) {	

    dw_Rotator.clearTimers(n);

}



dw_Rotator.clearTimers = function(n) {

    var obj = dw_Rotator.col[n]; 

    if ( obj ) {

        clearTimeout( obj.timer ); obj.timer = null;

    }

}



dw_Rotator.resume = function(n) {

    dw_Rotator.clearTimers(n);

    var obj = dw_Rotator.col[n]; 

    if ( obj ) {

        obj.timer = setTimeout( obj.animString + ".rotate()", dw_Rotator.restartDelay );

    }

}