DHTML TRANSITION EFFECT

HTML
HEAD
SCRIPT language=JavaScript
var g_awal="a.bmp";
var g_akhir="b.bmp";
function transisi()
{
gambar.filters.item(0).Apply();
gambar.src=g_akhir;
g_akhir=g_awal;
g_awal=gambar.src;
gambar.filters.item(0).Play();
}
/SCRIPT
/HEAD
BODY
IMG id=gambar style="FILTER: revealTrans(Duration=2)" src="a.bmp"
br
INPUT onclick="transisi()" type=button value="Mulai"
/BODY
/HTML