body{padding-top:10px;}
.all_bg{width:800px;height:600px;margin:0 auto;}
#allcanvas{position:relative; width:800px; height:600px; margin:0px;}
#canvas1{position:absolute;bottom:0;left:0;z-index:1;}
#canvas2{position:absolute;bottom:0;left:0;z-index:0;}