number = 0;

//first imageArray
image[number++] = "<a href='hydraulic_rescue_tools.html'><img src='images/callout_top/genesis.jpg' border='0'></a>"
image[number++] = "<a href='struts_shoring_stabilization.html'><img src='images/callout_top/stabilization-struts.jpg' border='0'></a>"
image[number++] = "<a href='air_lifting_bags.html'><img src='images/callout_top/matjack.jpg' border='0'></a>"
image[number++] = "<a href='auto-crib.html'><img src='images/callout_top/auto-crib.jpg' border='0'></a>"
image[number++] = "<a href='one_step_coupler.html'><img src='images/callout_top/one-step.jpg' border='0'></a>"
image[number++] = "<a href='robopaks.html'><img src='images/callout_top/robopaks.jpg' border='0'></a>"
image[number++] = "<a href='boron_capable.html'><img src='images/callout_top/boron-capable.jpg' border='0'></a>"
image[number++] = "<a href='genesis_pumps.html'><img src='images/callout_top/eco-silent.jpg' border='0'></a>"
// keep adding items here...

increment = Math.floor(Math.random() * number);

document.write(image[increment]);

number = 0;

//second imageArray
image[number++] = "<a href='ultramotion.html'><img src='images/callout_middle/ultramotion-turnouts.jpg' border='0'></a>"
image[number++] = "<a href='stc_structure_boots.html'><img src='images/callout_middle/stc-footwear.jpg' border='0'></a>"
image[number++] = "<a href='rescue_gloves.html'><img src='images/callout_middle/rescue-gloves.jpg' border='0'></a>"
image[number++] = "<a href='structure_firefighting_gloves.html'><img src='images/callout_middle/titan-gloves.jpg' border='0'></a>"
image[number++] = "<a href='ems_extrication_gear.html'><img src='images/callout_middle/ems-suits.jpg' border='0'></a>"
image[number++] = "<a href='stock-turnouts.html'><img src='images/callout_middle/stock-turnouts.jpg' border='0'></a>"
image[number++] = "<a href='helmets.html'><img src='images/callout_middle/helmets.jpg' border='0'></a>"
image[number++] = "<a href='wildland_gear.html'><img src='images/callout_middle/wildland-gear.jpg' border='0'></a>"
// keep adding items here...

increment = Math.floor(Math.random() * number);

document.write(image[increment]);

number = 0;

//third imageArray
image[number++] = "<a href='argus4-hr320.html'><img src='images/callout_bottom/argus4-hr320.jpg' border='0'></a>"
image[number++] = "<a href='attack_line.html'><img src='images/callout_bottom/aquaflow-plus.jpg' border='0'></a>"
image[number++] = "<a href='compressed_air_foam.html'><img src='images/callout_bottom/tri-max.jpg' border='0'></a>"
image[number++] = "<a href='nozzles.html'><img src='images/callout_bottom/protek-nozzles.jpg' border='0'></a>"
image[number++] = "<a href='ventilation_fans.html'><img src='images/callout_bottom/ventry-fans.jpg' border='0'></a>"
image[number++] = "<a href='argus4-320.html'><img src='images/callout_bottom/argus4-320.jpg' border='0'></a>"
image[number++] = "<a href='coupling-options.html'><img src='images/callout_bottom/wayout-couplings.jpg' border='0'></a>"
image[number++] = "<a href='valves_appliances.html'><img src='images/callout_bottom/valves-appliances.jpg' border='0'></a>"
// keep adding items here...

increment = Math.floor(Math.random() * number);

document.write(image[increment]);