if (document.images) {
  i1on = new Image();
  i1on.src = "images/left/m1_o.gif";
  i2on = new Image();
  i2on.src = "images/left/m2_o.gif";
  i3on = new Image();
  i3on.src = "images/left/m3_o.gif";
  i4on = new Image();
  i4on.src = "images/left/m4_o.gif";
  i5on = new Image();
  i5on.src = "images/left/m5_o.gif";
  i6on = new Image();
  i6on.src = "images/left/m6_o.gif";
  i7on = new Image();
  i7on.src = "images/left/m7_o.gif";


  i1off = new Image();
  i1off.src = "images/left/m1.gif";
  i2off = new Image();
  i2off.src = "images/left/m2.gif";
  i3off = new Image();
  i3off.src = "images/left/m3.gif";
  i4off = new Image();
  i4off.src = "images/left/m4.gif";
  i5off = new Image();
  i5off.src = "images/left/m5.gif";
  i6off = new Image();
  i6off.src = "images/left/m6.gif";
  i7off = new Image();
  i7off.src = "images/left/m7.gif";

}
function changeImages()
        {if (document.images)
                {for (var i=0; i<changeImages.arguments.length; i+=2)
                        {document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
                            }
                  }
        }