$(function(){
    $('.asset-more').hide();
    flag = Array();
})

function readMore(id){
    var s  = 'add_area_' + id;
    $('#' + s).slideToggle('', changeText(id));
}

function changeText(id){
    var t = 'add_trigger_' + id;

    if(!flag[id]){
        $('#' + t).html('続きを隠す');
        flag[id] = 1;
    }
    else{
        $('#' + t).html('続きを読む');
        flag[id] = null;
    }
    
}