Variable and array looping

[Ampulator00]

var thisPic = [0, 0, 0, 0, 0];
function chgSlide(change, direction)
    {
    if(document.images)
        {
        thisPic[change] += direction;
        imgCt = (imageChoice[change].length -1 && altChoice[change].length -1);
        if(thisPic[change] > imgCt)
            thisPic[change] = 0;
        if(thisPic[change] < 0)
            thisPic[change] = imgCt;
        document.getElementById(slideID[change]).src = imageChoice[change][thisPic[change]];
        document.getElementById(slideID[change]).alt = altChoice[change][thisPic[change]];
        }
    } 

The issue is, that I have to put make a new array each time I use the variable "thisPic"; I have been trying to make it loop, but everytime I test it, the browsers I use freezes (Internet Explorer 6.02, Mozilla 1.73, Firefox 1.0). This is a manual slideshow script.

Here's the code that doesn't work:

var thisPic = new Array();
function chgSlide(change, direction)
    {
    
    for (change = 0; change < (imageChoice[change].length -1 && altChoice[change].length -1); change++)
        {
        if(document.images)
            {
            thisPic[change] += direction;
            imgCt = (imageChoice[change].length -1 && altChoice[change].length -1);
            if(thisPic[change] > imgCt)
                thisPic[change] = 0;
            if(thisPic[change] < 0)
                thisPic[change] = imgCt;
            document.getElementById(slideID[change]).src = imageChoice[change][thisPic[change]];
            document.getElementById(slideID[change]).alt = altChoice[change][thisPic[change]];
            }        
        }

    } 

And here's a separate script that also needs a loop help wit the variable "thisAd":

var cutinID = ["cutin1", "cutin2", "cutin3"], 
var thisAd = [-1, -1, -1];

function cycle(x)
    {
    if(document.getElementById(cutinID[x]).complete)
        {
        thisAd[x]++;
        if(thisAd[x] == time[x])
            thisAd[x] = 0;
    document.getElementById(cutinID[x]).src = cutinChoice[x][thisAd[x]];
        }
    setTimeout(function(){cycle(x);} , 2e3);
    }