function button(Name,File,tagle)
 {
  if (tagle)
        {
		  document.images[Name].src = eval(File + "off.src");
		  }
      else
        {document.images[Name].src = eval(File + "on.src");}
}
{
  but1on = new Image();
  but1on.src ="../img-mn/kn1a.jpg";
  but1off = new Image();
  but1off.src ="../img-mn/kn1b.jpg";
  but2on = new Image();
  but2on.src ="../img-mn/kn2a.jpg";
  but2off = new Image();
  but2off.src ="../img-mn/kn2b.jpg";
  but3on = new Image();
  but3on.src ="../img-mn/kn3a.jpg";
  but3off = new Image();
  but3off.src ="../img-mn/kn3b.jpg";
  but4on = new Image();
  but4on.src ="../img-mn/kn4a.jpg";
  but4off = new Image();
  but4off.src ="../img-mn/kn4b.jpg";
}