让图片乱跳

<img src="ex1-2/DSC_0699.jpg" width="200" />
<script>
R=0;
x1=.1;
y1=.05;
x2=.25;
y2=.24;
x3=1.6;
y3=.24;
x4=300;
y4=200;
x5=300;
y5=200;
DI=document.images;
DIL=DI.length;
function A(){
for(i=0; i-DIL; i++)
{
DIS=DI[i].style;
DIS.position='absolute';
DIS.left=Math.cos(R*x1+i*x2+x3)*x4+x5;
DIS.top=Math.sin(R*y1+i*y2+y3)*y4+y5;
}
R++
}

setInterval('A()',300);
void(0);
</script>

广州正