var t_off;
function pd(num){
pd_off();
if(t_off){timer_off()}
	if (document.all) document.all["pd"+num].style.visibility = "visible";
	if (document.layers) document.layers["pd"+num].visibility = "visible";
	if (!document.all && document.getElementById) document.getElementById("pd"+num).style.visibility = "visible";

	iname="b"+num;
	document.images[iname].src = "image/but/but_" +num+ "_1.gif";

}

function pd_off(mnum,onoff){
	for (i=1; i<=18; i++)	{
	if (document.all) document.all["pd"+i].style.visibility = "hidden";
	if (document.layers) document.layers["pd"+i].visibility = "hidden";
	if (!document.all && document.getElementById) document.getElementById("pd"+i).style.visibility = "hidden";
	}

	for (i=1; i<=18; i++)	{
	iname="b"+i;
	document.images[iname].src = "image/but/but_" +i+ "_0.gif";
	}
}

function timer(){
t_off = setTimeout("pd_off()", 200);
}


function timer_off(){
clearTimeout(t_off);
}


//プリロードイメージ//

for (i=0; i<=22; i++){
	for (j=0; j<=1; j++){
		(new Image()).src = "image/but/but_"+i+"_"+j+".gif";
	}
}
//for (i=11; i<=80; i++){
//	for (j=0; j<=1; j++){
//		(new Image()).src = "image/but/sub_but_"+i+"_"+j+".gif";
//	}
//}

//イメージチェンジ//

function bt(mnum,onoff){
if(mnum==19){
	iname="b"+mnum;
	document.images[iname].src = "image/but2/but_" +mnum+ "_" +onoff+ ".gif";
}else{
	iname="b"+mnum;
	document.images[iname].src = "image/but/but_" +mnum+ "_" +onoff+ ".gif";
}
}

function sbt(mnum,onoff){
	isname="sb"+mnum;
	document.images[isname].src = "image/but/sub_but_" +mnum+ "_" +onoff+ ".gif";
}