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.margin=margin;
img.style.zIndex=zIndex;}}, delay);}

function larger(img, width, height)
{img.dir='rtl';
now=parseInt(img.style.zIndex);
for (i=now+1; i<=10; i++)
{w=(width*(10+i))/20+'px';
h=(height*(10+i))/20+'px';
m=(-i)+'px 0 0 '+(-width*i/40)+'px';
setZoom(img, 'rtl', w, h, m, i, 20*(i-now));}}

function smaller(img, width, height)
{img.dir='ltr';
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/40)+'px';
setZoom(img, 'ltr', w, h, m, i, 20*(now-i));}}