function exchangeImage(calledFromIndex) {
var mainImageTag                            = document.getElementById('main-image');
var urlField                                = document.getElementById('largeImage_' + calledFromIndex);
mainImageTag.src                            = urlField.value;
document.dummyForm.currentImageIndex.value  = calledFromIndex;
return false;
}
function zoomCurrentImage() {
var currentIndex                            = document.dummyForm.currentImageIndex.value;
if(currentIndex.length > 0) {
var zoomImageField                        = document.getElementById('zoomImage_' + currentIndex);
var zoomImageURL                          = zoomImageField == null ? null : zoomImageField.value;
if(zoomImageURL != null && zoomImageURL.length > 0) {
window.open(zoomImageURL, "_blank", "left=10,top=10,width=800,height=600,resizable=yes,scrollbars=yes");
}
}
return false;
}