function showpara(num) {
	if(document.getElementById) {
		document.getElementById("box" + num).style.display = "block";
	}
	return false;
}
function hidepara(num) {
	if(document.getElementById) {
		document.getElementById("box" + num).style.display = "none";
	}
	return false;
}
function shownavi(num) {
	if(document.getElementById) {
		document.getElementById("nbox" + num).style.display = "block";
		document.getElementById("nv" + num).style.display = "none";
		document.getElementById("cls" + num).style.display = "inline";
	}
	return false;
}
function hidenavi(num) {
	if(document.getElementById) {
		document.getElementById("nbox" + num).style.display = "none";
		document.getElementById("nv" + num).style.display = "inline";
		document.getElementById("cls" + num).style.display = "none";
	}
	return false;
}