up-down circular boundaries (pipe-surface)
var speed=80; var Xreflectionrate=0.5;
function checkY(y,Num){ height=parseIntohnepx(StyleOfTheSquare[Num].height); edge=doc_height-height if (y > edge) { y=0 + y - edge; } if (y<0) { y=doc_height+y; } return y; }