var imgcache1 = new Array()
var imgcache2 = new Array()
function precache(imageDir, name_list) {
    for (i=0; i < name_list.length; i++) {
      imgcache1[i] = new Image(150,40);
      imgcache1[i].src = imageDir +"/"+ name_list[i] + "hover.gif";
      imgcache2[i] = new Image(150,40);
      imgcache2[i].src = imageDir +"/"+ name_list[i] + ".gif";
    }
}


function rollIn(imageDir, imgName) {
      imgFile = imageDir +"/"+ imgName + "hover.gif";
      document [imgName].src = imgFile;
}

function rollOut(imageDir, imgName) {
      imgFile = imageDir +"/"+ imgName + ".gif";
      document [imgName].src = imgFile;
}