var disp = '';
function showBlock(id,icoid) {
    var showico;
    disp = document.getElementById(id).style.display;
    showico = document.getElementById(icoid);

    if (disp != "none" || disp == "") {
        document.getElementById(id).style.display = "none";
        showico.innerHTML = '<img src="img/ico_arrow_s.png" title="概要をオープン" />';
    } else {
        document.getElementById(id).style.display = "block";
        showico.innerHTML = '<img src="img/ico_arrow_s2.png" title="概要をクローズ" />';
    }
}

var show = false;
function showAll() {
	var ul = document.getElementById('txtlink');
	var elm = ul.getElementsByTagName('LI').length;
	var inner = document.getElementById('showall');
	var i,tmp;
	
	if(show == false) {
    	for(i=0; i<elm; i++) {
    		tmp = 'link' + i;
    		tmp2 = 'show' + i;
    		document.getElementById(tmp).style.display = "block";
    		document.getElementById(tmp2).innerHTML = '<img src="img/ico_arrow_s2.png" title="概要をクローズ" />';
    	}
    	inner.innerHTML = '<img src="img/ico_arrow_s2.png" title="全ての概要をクローズ" />';
    	show = true;
	} else {
		for(i=0; i<elm; i++) {
    		tmp = 'link' + i;
    		tmp2 = 'show' + i;
    		document.getElementById(tmp).style.display = "none";
    		document.getElementById(tmp2).innerHTML = '<img src="img/ico_arrow_s.png" title="概要をオープン" />';
    	}
    	inner.innerHTML = '<img src="img/ico_arrow_s.png" title="全ての概要をオープン" />';
    	show = false;
	}
}