wx = 760;
wy = 500;
x = (screen.width  - wx) / 2;
y = (screen.height - wy) / 2;

function win01() {window.open("/topic/watermargin.htm","win1","left="+x+",top="+y+",menubar=no,toolbar=no,location=no,directories=no,status=no,scrollbars=no,width="+wx+",height="+wy);}
function win02() {window.open("/food/watermargin.htm","win2","left="+x+",top="+y+",menubar=no,toolbar=no,location=no,directories=no,status=no,scrollbars=no,width="+wx+",height="+wy);}