/*  

    dw_random.js - random image rotation - version date: April 2005

    requires dw_rotator.js 

*/



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

    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_RandRotator is subclass of dw_Rotator

// it has its own rotate method, and adds a setupImage method

dw_RandRotator.prototype = new dw_Rotator();



// constructor arguments: (all optional) rotation speed, path to images, 

// linked? (boolean), mouse events? (boolean), target window name

function dw_RandRotator(sp, pt, bClickable, bMouse, tgt) {

    this.num = dw_Rotator.col.length; this.name = "RandRotateImg" + this.num;

    this.mouseEvs = bMouse; this.clickable = bClickable;

    // call method available to replace following 2 steps as of JS 1.3 (ns6/ie5.5)

    this.rObj = dw_Rotator; this.rObj(this.name, sp, pt, tgt); 

}



// arguments: images array, width and height of images, transition filter? (boolean)

dw_RandRotator.prototype.setUpImage = function(imgAr, w, h, bTrans) {

    this.trans = bTrans;

   	this.ctr = Math.floor( Math.random() * imgAr.length );

    var img = imgAr[ this.ctr ];

    var imgStr = '<img name="' + this.name + '" src="' + this.path + img + '"';

    imgStr += ( typeof w == "number") ? ' width="' + w + '"': ''; 

    imgStr += ( typeof h == "number") ? ' height="' + h + '"': ''; 

    imgStr += ' alt="">';

    var str = "";

    if (this.clickable) { // link it

        str += '<a href="" onclick="return dw_Rotator.doClick(' + this.num + ')"';

        if (this.mouseEvs) {

            str += ' onmouseover="dw_Rotator.pause(' + this.num + ')"' 

            str += ' onmouseout="dw_Rotator.resume(' + this.num + ')"';

        }

        str += ' onfocus="this.blur()">' + imgStr + '</a>';

    } else {

        str = imgStr;

    }

    document.write(str); document.close();

    for (var i=0; imgAr[i]; i++) this.addImages( imgAr[i] );

}



dw_RandRotator.prototype.rotate = function() { 

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

    var ctr = Math.floor( Math.random() * this.imgs.length );

    // repeat attempts to get new image, if necessary

    var i = 0;

    while ( ctr == this.ctr && i < 6 ) {

        ctr = Math.floor( Math.random() * this.imgs.length );

        i++; // limit # of loops

    }

    this.ctr = ctr;

    var imgObj = document.images[this.name];

    if (!imgObj) return;

    if ( this.trans && typeof imgObj.filters != "undefined" ) {

   	    imgObj.style.filter = 'blendTrans(duration=1)';

        if (imgObj.filters.blendTrans) imgObj.filters.blendTrans.Apply();

    }

    imgObj.src = this.imgs[this.ctr].src;

    if ( this.trans && typeof imgObj.filters != "undefined" && imgObj.filters.blendTrans )

        imgObj.filters.blendTrans.Play(); 



    this.timer = setTimeout( this.animString + ".rotate()", this.speed);                        

}