if (document.images) {

   BM1_off = new Image(); BM1_off.src = "images/bm1.gif"
   BM1_over = new Image(); BM1_over.src = "images/bm1-ov.gif"

   BM2_off = new Image(); BM2_off.src = "images/bm2.gif"
   BM2_over = new Image(); BM2_over.src = "images/bm2-ov.gif"

   BM3_off = new Image(); BM3_off.src = "images/bm3.gif"
   BM3_over = new Image(); BM3_over.src = "images/bm3-ov.gif"

   BM4_off = new Image(); BM4_off.src = "images/bm4.gif"
   BM4_over = new Image(); BM4_over.src = "images/bm4-ov.gif"

   BM5_off = new Image(); BM5_off.src = "images/bm5.gif"
   BM5_over = new Image(); BM5_over.src = "images/bm5-ov.gif"

   BM6_off = new Image(); BM6_off.src = "images/bm6.gif"
   BM6_over = new Image(); BM6_over.src = "images/bm6-ov.gif"

   B1_off = new Image(); B1_off.src = "images/b1.gif"
   B1_over = new Image(); B1_over.src = "images/b1-ov.gif"

   B2_off = new Image(); B2_off.src = "images/b2.gif"
   B2_over = new Image(); B2_over.src = "images/b2-ov.gif"

   B3_off = new Image(); B3_off.src = "images/b3.gif"
   B3_over = new Image(); B3_over.src = "images/b3-ov.gif"

   B4_off = new Image(); B4_off.src = "images/b4.gif"
   B4_over = new Image(); B4_over.src = "images/b4-ov.gif"

   B5_off = new Image(); B5_off.src = "images/b5.gif"
   B5_over = new Image(); B5_over.src = "images/b5-ov.gif"

   B6_off = new Image(); B6_off.src = "images/b6.gif"
   B6_over = new Image(); B6_over.src = "images/b6-ov.gif"

   B7_off = new Image(); B7_off.src = "images/b7.gif"
   B7_over = new Image(); B7_over.src = "images/b7-ov.gif"

   B8_off = new Image(); B8_off.src = "images/b8.gif"
   B8_over = new Image(); B8_over.src = "images/b8-ov.gif"

   B9_off = new Image(); B9_off.src = "images/b9.gif"
   B9_over = new Image(); B9_over.src = "images/b9-ov.gif"
}

function turn_off(ImageName)  {document[ImageName].src = eval(ImageName + "_off.src");}
function turn_over(ImageName) {document[ImageName].src = eval(ImageName + "_over.src");}