// JavaScript Document
function expand(obj, stat){
    if(stat != 0) {
        var sroot = 'http://www.apagency.jp/images/left_column/';
        var OFF_IMG = "side_nav01_off.gif";
        var OVER_IMG = "side_nav01_over.gif";

        var curImgSrc = document.images["img_" + stat].src;
        var imgNm = curImgSrc.substring(eval(curImgSrc.lastIndexOf("/")) + 1, curImgSrc.length);
        var alt = document.images["img_" + stat].alt;
        document.images["img_" + stat].src = sroot + (imgNm == OVER_IMG ? OFF_IMG : OVER_IMG);
        document.images["img_" + stat].alt = alt.substr(0,alt.length-3) + (imgNm == OVER_IMG ? "開ける" : "閉じる");

        var curr = document.getElementById(stat);
        curr.className = (curr.className == "exp_hid" ? "exp" : "exp_hid");
    }
    return false;
}
expand(0, 0);