function over(id) {
  switch (id) {
    case 1:
      elem = document.getElementById('link1');
      elem.src = "images/hover/gold_text_03.png";
      break;
    case 2:
      elem = document.getElementById('link2');
      elem.src = "images/hover/gold_text_05.png";
      break;
    case 3:
      elem = document.getElementById('link3');
      elem.src = "images/hover/gold_text_07.png";
      break;
    case 4:
      elem = document.getElementById('link4');
      elem.src = "images/hover/gold_text_09.png";
      break;
  }
}
function out(id) {
  switch (id) {
    case 1:
      elem = document.getElementById('link1');
      elem.src = "images/gold_text_03.png";
      break;
    case 2:
      elem = document.getElementById('link2');
      elem.src = "images/gold_text_05.png";
      break;
    case 3:
      elem = document.getElementById('link3');
      elem.src = "images/gold_text_07.png";
      break;
    case 4:
      elem = document.getElementById('link4');
      elem.src = "images/gold_text_09.png";
      break;
  }
}