function setZoom(img, dir, width, height, margin, zIndex, delay) {
  setTimeout(function() {
    if (img.dir==dir) {
      img.style.width=width;
      img.style.height=height;
      img.style.zIndex=zIndex;
	  div.style.width=width;
      img.parentNode.parentNode.style.zIndex=zIndex;

    }
  }, delay);
}


function increase(img, width, height) {
  img.dir='ltr';  
  now=parseInt(img.style.zIndex);
  for (i=now+2; i<=24; i++) {
    w=(width*(10+i))/20+'px';
    h=(height*(10+i))/20+'px';
    m=(100)+'px'+(+width*i/65)+'px';
    setZoom(img, 'ltr', w, h, m, i, 15*(i-now));
  }
}

function decrease(img, width, height) {
  img.dir='rtl';  
  now=parseInt(img.style.zIndex);
  for (i=now-1; i>=0; i--) {
    w=(width*(10+i))/20+'px';
    h=(height*(10+i))/20+'px';
    m=(-i)+'px 0 0 '+(-width*i/65)+'px';
    setZoom(img, 'rtl', w, h, m, i, 5*(now-i));
  }
}