var imageFiles_hk_4 = new Array();
imageFiles_hk_4['0'] = new Array ('_images/hk_Chapter_7.gif', '_images/hk_Chapter_7Mouseover.gif');
imageFiles_hk_4['1'] = new Array ('_images/hk_Chapter_11.gif', '_images/hk_Chapter_11Mouseover.gif');

function image_on_hk_4 (position) {
   var doc = eval("document.imagehk_4" + position);
   doc.src = imageFiles_hk_4[position][1];
}

function image_off_hk_4 (position) {
   var doc = eval("document.imagehk_4" + position);
   doc.src = imageFiles_hk_4[position][0];
}