if (document.images) {
nav1_B1_off = new Image(); nav1_B1_off.src = "nav1_B1.gif"
nav1_B1_over = new Image(); nav1_B1_over.src = "nav1_B1_over.gif"
nav1_B2_off = new Image(); nav1_B2_off.src = "nav1_B2.gif"
nav1_B2_over = new Image(); nav1_B2_over.src = "nav1_B2_over.gif"
nav1_B3_off = new Image(); nav1_B3_off.src = "nav1_B3.gif"
nav1_B3_over = new Image(); nav1_B3_over.src = "nav1_B3_over.gif"
nav1_B4_off = new Image(); nav1_B4_off.src = "nav1_B4.gif"
nav1_B4_over = new Image(); nav1_B4_over.src = "nav1_B4_over.gif"
nav1_B5_off = new Image(); nav1_B5_off.src = "nav1_B5.gif"
nav1_B5_over = new Image(); nav1_B5_over.src = "nav1_B5_over.gif"
}
function turn_off(ImageId) {
  if (document.images != null) {
    document[ImageId].src = eval(ImageId + "_off.src");
  }
}
function turn_over(ImageId) {
  if (document.images != null) {
    document[ImageId].src = eval(ImageId + "_over.src");
  }
}