菜鸟求帮忙看个javascript看看哪里错了,谢谢

function mouseOver(_area, _pos, obj) { clearFocus(_area, _pos); area = _area; pos = _pos; switch (area) { case 3: btnImgPos = pos; $("btnImgFocus").style.left = 354 + btnImgPos * 90 + "px";