var imageFiles_a_4 = new Array();
imageFiles_a_4['0'] = new Array ('_images/a_HOME_COMPUTERS.gif', '_images/a_HOME_COMPUTERSMouseover.gif');
imageFiles_a_4['1'] = new Array ('_images/a_BUSINESS_COMPUTERS.gif', '_images/a_BUSINESS_COMPUTERSMouseover.gif');
imageFiles_a_4['2'] = new Array ('_images/a_WIRELESS_NETWORKING.gif', '_images/a_WIRELESS_NETWORKINGMouseover.gif');
imageFiles_a_4['3'] = new Array ('_images/a_CONTACT_US.gif', '_images/a_CONTACT_USMouseover.gif');
imageFiles_a_4['4'] = new Array ('_images/a_.gif', '_images/a_Mouseover.gif');

function image_on_a_4 (position) {
   var doc = eval("document.imagea_4" + position);
   doc.src = imageFiles_a_4[position][1];
}

function image_off_a_4 (position) {
   var doc = eval("document.imagea_4" + position);
   doc.src = imageFiles_a_4[position][0];
}