imgArray[1] = new Image();
imgArray[1].src = "WhitePicture1.gif"; //this works
...

function displayPicture(int)

var image = document.getElementById('ImageNumber[int]'); //this doesn't work
var image = document.getElementById('ImageNumber' + int); //this doesn't work



image.src = imgArrayS[int] //doesn't work

var thefile = "imgArray" + int + ".gif"
image.src = thefile;                          //doesn't work