var imageFiles_b4_1 = new Array();
imageFiles_b4_1['0'] = new Array ('_images/b4_Members.gif', '_images/b4_MembersMouseover.gif');

function image_on_b4_1 (position) {
   var doc = eval("document.imageb4_1" + position);
   doc.src = imageFiles_b4_1[position][1];
}

function image_off_b4_1 (position) {
   var doc = eval("document.imageb4_1" + position);
   doc.src = imageFiles_b4_1[position][0];
}