function chg_menu(flg)
{
	if (flg != "1")
	{
		document.getElementById("menu_1").className = "normal";
	}
	if (flg != "2")
	{
		document.getElementById("menu_2").className = "normal";
	}
	if (flg != "3")
	{
		document.getElementById("menu_3").className = "normal";
	}
	if (flg != "4")
	{
		document.getElementById("menu_4").className = "normal";
	}

	document.getElementById("menu_" + flg).className = "current";

}
function show_sub_menu(flg,fix)
{
	document.getElementById("sub_menu_" + flg).style.display = "block";

	if (fix!= undefined)
	{
		document.getElementById("menu_" + fix).className = "normal";
	}
}
function hide_sub_menu(flg,fix)
{
	document.getElementById("sub_menu_" + flg).style.display = "none";
	document.getElementById("menu_" + flg).className = "normal";	
	
	if (fix!= undefined)
	{
		document.getElementById("menu_" + fix).className = "current";
	}
}