[JavaScript] 마우스 좌표값 구하기

function getPosX(obj){
    var tmpX = 0;
    if (obj.offsetParent) {
        do {
            tmpX += obj.offsetLeft;
        } while(obj = obj.offsetParent);
    }
    return tmpX;
}

function getPosY(obj){
    var tmpY = 0;
    if (obj.offsetParent) {
        do {
            tmpY += obj.offsetTop;
        } while(obj = obj.offsetParent);
    }
    return tmpY;
}