function showProduct(num){
	var pcount = 0;

	// 製品数の取得
	for(var i=1;; i++){
  		if(document.getElementById("pexplain"+ i)) pcount++; else break;
	}

	// 全ての製品の非表示
	for(var i=1; i <= pcount; i++){
		document.getElementById("pexplain"+i).style.display="none";
	}
	// 対象製品の表示
	document.getElementById("pexplain"+num).style.display="block";
}

// サブメニュー表示
function showMenu(num){
	document.getElementById("navi"+num).style.visibility="visible";
}
function hideMenu(num){
	document.getElementById("navi"+num).style.visibility="hidden";
}

// 製品説明表示
function showExplanation(num){
	document.getElementById(num).style.visibility="visible";
}
function hideExplanation(num){
	document.getElementById(num).style.visibility="hidden";
}