home1 = new Image();
home1.src = "http://www.linuxsoftware.co.nz/home1.png";
home2 = new Image();
home2.src = "http://www.linuxsoftware.co.nz/home2.png";

mail1 = new Image();
mail1.src = "http://www.linuxsoftware.co.nz/mail1.png";
mail2 = new Image();
mail2.src = "http://www.linuxsoftware.co.nz/mail2.png";

function linkOver(imgName) {
  if ( eval(imgName + "2.complete") ) {
    document.images[imgName].src = eval(imgName + "2.src");
  }
}

function linkOut(imgName) {
  if ( eval(imgName + "1.complete") ) {
    document.images[imgName].src = eval(imgName + "1.src");
  }
}