if (arr[i]){                 var ofs=$(this).offset();                 var x=parseInt(ofs.left);                 var y =parseInt(ofs.top);                 var vy=parseInt($(this).attr("vy"));                 x +=wind;                 vy *= ay;                 y+= vy;                 $(this).offset({"top":y});                 $(this).offset({"left":x});                 if(y>winHeight){                     $(this).remove();                     delete arr[i];                 }