agent = navigator.userAgent;
  rollovercheck = 0;
  if (agent.substring(0,7) == "Mozilla")
  {
    if (parseInt(agent.substring(8,9)) >= 3) { rollovercheck=1; }
    if (agent.indexOf("MSIE 3") != -1) { rollovercheck=0; }
  }

if (rollovercheck) {  // If browser is acceptable, preload images
                                          
jvkco1 = new Image();
jvkco1.src ="images/nav/kpk1.jpg";
jvkco1a = new Image();
jvkco1a.src ="images/nav/kpk2.jpg";
jvkco2 = new Image();
jvkco2.src ="images/nav/jws1.jpg";
jvkco2a = new Image();
jvkco2a.src ="images/nav/jws2.jpg";
jvkco3 = new Image();
jvkco3.src ="images/nav/kws1.jpg";
jvkco3a = new Image();
jvkco3a.src ="images/nav/kws2.jpg";
jvkco4 = new Image();
jvkco4.src ="images/nav/kld1.jpg";
jvkco4a = new Image();
jvkco4a.src ="images/nav/kld2.jpg";
jvkco5 = new Image();
jvkco5.src ="images/nav/kps1.jpg";
jvkco5a = new Image();
jvkco5a.src ="images/nav/kps2.jpg";
jvkco6 = new Image();
jvkco6.src ="images/nav/wd1.jpg";
jvkco6a = new Image();
jvkco6a.src ="images/nav/wd2.jpg";
jvkco7 = new Image();
jvkco7.src ="images/nav/flightoperations1.jpg";
jvkco7a = new Image();
jvkco7a.src ="images/nav/flightoperations2.jpg";
jvkco8 = new Image();
jvkco8.src ="images/bottomnav/bottomnavKPKabout.jpg";
jvkco8a = new Image();
jvkco8a.src ="images/bottomnav/bottomnavKPKaboutover.jpg";
jvkco9 = new Image();
jvkco9.src ="images/bottomnav/bottomnavKPKteam.jpg";
jvkco9a = new Image();
jvkco9a.src ="images/bottomnav/bottomnavKPKteamover.jpg";
jvkco10 = new Image();
jvkco10.src ="images/bottomnav/bottomnavKPKpress.jpg";
jvkco10a = new Image();
jvkco10a.src ="images/bottomnav/bottomnavKPKpressover.jpg";
jvkco11 = new Image();
jvkco11.src ="images/bottomnav/bottomnavKPKlocations.jpg";
jvkco11a = new Image();
jvkco11a.src ="images/bottomnav/bottomnavKPKlocationsover.jpg";
jvkco12 = new Image();
jvkco12.src ="images/bottomnav/bottomnavJWSabout.jpg";
jvkco12a = new Image();
jvkco12a.src ="images/bottomnav/bottomnavJWSaboutover.jpg";
jvkco13 = new Image();
jvkco13.src ="images/bottomnav/bottomnavJWSlocations.jpg";
jvkco13a = new Image();
jvkco13a.src ="images/bottomnav/bottomnavJWSlocationsover.jpg";
jvkco14 = new Image();
jvkco14.src ="images/bottomnav/bottomnavJWSequipment.jpg";
jvkco14a = new Image();
jvkco14a.src ="images/bottomnav/bottomnavJWSequipmentover.jpg";
jvkco15 = new Image();
jvkco15.src ="images/bottomnav/bottomnavKWSabout.jpg";
jvkco15a = new Image();
jvkco15a.src ="images/bottomnav/bottomnavKWSaboutover.jpg";
jvkco16 = new Image();
jvkco16.src ="images/bottomnav/bottomnavKWSlocations.jpg";
jvkco16a = new Image();
jvkco16a.src ="images/bottomnav/bottomnavKWSlocationsover.jpg";
jvkco17 = new Image();
jvkco17.src ="images/bottomnav/bottomnavKWSequipment.jpg";
jvkco17a = new Image();
jvkco17a.src ="images/bottomnav/bottomnavKWSequipmentover.jpg";
jvkco18 = new Image();
jvkco18.src ="images/bottomnav/bottomnavKLDabout.jpg";
jvkco18a = new Image();
jvkco18a.src ="images/bottomnav/bottomnavKLDaboutover.jpg";
jvkco19 = new Image();
jvkco19.src ="images/bottomnav/bottomnavKLDlocations.jpg";
jvkco19a = new Image();
jvkco19a.src ="images/bottomnav/bottomnavKLDlocationsover.jpg";
jvkco20 = new Image();
jvkco20.src ="images/bottomnav/bottomnavKPSabout.jpg";
jvkco20a = new Image();
jvkco20a.src ="images/bottomnav/bottomnavKPSaboutover.jpg";
jvkco21 = new Image();
jvkco21.src ="images/bottomnav/bottomnavKPSlocations.jpg";
jvkco21a = new Image();
jvkco21a.src ="images/bottomnav/bottomnavKPSlocationsover.jpg";
jvkco22 = new Image();
jvkco22.src ="images/bottomnav/bottomnavWDabout.jpg";
jvkco22a = new Image();
jvkco22a.src ="images/bottomnav/bottomnavWDaboutover.jpg";
jvkco23 = new Image();
jvkco23.src ="images/bottomnav/bottomnavWDlocation.jpg";
jvkco23a = new Image();
jvkco23a.src ="images/bottomnav/bottomnavWDlocationover.jpg";
}

function changeImage(imgDocID,imgObjName) {

   if (rollovercheck) {  // If browser is cool, swap images
   {document.images[imgDocID].src = eval(imgObjName + ".src");}
                                }
}