var isOK = parseInt(navigator.appVersion) > 3;

if(isOK) {
  p1a = new Image(); p1a.src = "../gfx/M21.jpg"; 
  p1b = new Image(); p1b.src = "../gfx/M21a.jpg";

  p2a = new Image(); p2a.src = "../gfx/M31.jpg"; 
  p2b = new Image(); p2b.src = "../gfx/M31a.jpg";

  p3a = new Image(); p3a.src = "../gfx/M41.jpg"; 
  p3b = new Image(); p3b.src = "../gfx/M41a.jpg";

  p7a = new Image(); p7a.src = "../gfx/M65.jpg"; 
  p7b = new Image(); p7b.src = "../gfx/M65a.jpg";

}

function isOver(nr, who) {
  if(isOK) { pic = eval("p" + nr + "b.src"); document[who].src = pic; }
}

function isOut(nr,who) {
  if(isOK) { pic = eval("p" + nr + "a.src"); document[who].src = pic; }
}