Newbie Help with loops

I thought I posted this, but it's not showing up so I'll try one more time:

I'm trying to build a slide show that creates an array of variables
(thumb1, thumb2, thumb3, etc) and assigns a src and a href to the
current slide the when the thumbnail is clicked.  I have it working
fine when I explicitly write it out, but I'm trying to build a look
that will dynamically create the variable name, and then set the index
the linkArray and the imageArray.  It's building it fine, the src and
href both change, however they don't change as expected.  Basically
i'll get thumb0 with the src for 1 and the href for some other index.
I can't figure out what i'm doing wrong!  i'm frustrated, but I'm sure
it's something simple I'm overlooking.  I'm pretty new to writing the
code from scratch.

here's the code i'm using, i would appreciate any help anyone could
offer:

setInterval(changeImage,3000);

//set variables for main Slide show
var currentSlide = document.getElementById("currentSlide");
var currentLink = document.getElementById("currentLink");

var imageArray =
["image1.JPG","image2.JPG","image3.JPG","image4.JPG"];

var linkArray = ["link1.html","link2.html","link3.html","link4.html"];

var imageIndex = 0;

//Changes current slide automatically
function changeImage() {
       currentSlide.setAttribute("src",imageArray[imageIndex]);
       imageIndex++;
       if (imageIndex >= imageArray.length) {
               imageIndex = 0;
       }
}

//set variables for thumbnail strip
var thumbnails = document.getElementById("thumbnails");

var dynamicThumbs = document.getElementById("dynamicThumbs");

var thumbnailArray = new Array();


for (i=0; i<imageArray.length; i++) {
       thumbnailArray[i] = document.createElement("img");
       dynamicThumbs.appendChild(thumbnailArray[i]);
       thumbnailArray[i].setAttribute("src",imageArray[i]);
       thumbnailArray[i].setAttribute("width",100);
       thumbnailArray[i].onclick = function(){
               currentSlide.setAttribute("src", imageArray[i]);
               currentSlide.setAttribute("href", linkArray[i]);
               if (i < imageArray.length){
                       imageIndex++;}
                       else {
                               imageIndex = 0;
                       };
       };
}

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