var imageFiles_jk_1 = new Array();
imageFiles_jk_1['0'] = new Array ('_images/jk_Home.gif', '_images/jk_HomeMouseover.gif');
imageFiles_jk_1['1'] = new Array ('_images/jk_CT_Materials.gif', '_images/jk_CT_MaterialsMouseover.gif');
imageFiles_jk_1['2'] = new Array ('_images/jk_CWT_Materials.gif', '_images/jk_CWT_MaterialsMouseover.gif');
imageFiles_jk_1['3'] = new Array ('_images/jk_MCT_Materials.gif', '_images/jk_MCT_MaterialsMouseover.gif');

function image_on_jk_1 (position) {
   var doc = eval("document.imagejk_1" + position);
   doc.src = imageFiles_jk_1[position][1];
}

function image_off_jk_1 (position) {
   var doc = eval("document.imagejk_1" + position);
   doc.src = imageFiles_jk_1[position][0];
}