$(function() {
    $('#slip_num_button').click(function(){
        var slipNum = $('#slip_num').val();

        slipNum = slipNum.replace('-', '');

        if (slipNum.substr(0, 1) == 8) {
            window.open('http://tracking.post.japanpost.jp/service/singleSearch.do?org.apache.struts.taglib.html&searchKind=S001&locale=ja&SVID=024&reqCodeNo1=' + slipNum, 'track').focus();
        } else {
            window.open('http://tracking.post.japanpost.jp/service/singleSearch.do?org.apache.struts.taglib.html&searchKind=S002&locale=ja&SVID=023&reqCodeNo1=' + slipNum, 'track').focus();
        }
    });
});