var last_nav_name = "";
function showSubNavi(num) {
	if (last_nav_name) {
		document.getElementById(last_nav_name).className = "nav_leftOff" ;
	}
	for (i=1; i<=5; i++) {
		if(document.getElementById(i).style.display == "inline") {
			document.getElementById(i).style.display = "none" ;
		}
	}
	document.getElementById(num).style.display = "inline" ;
}

function MNavClick(nav_name) {
	for (i=1; i<=7; i++) {
		if(document.getElementById('M_'+i).className = "nav_mainOn") {
			document.getElementById('M_'+i).className = "nav_mainOff" ;
		}
	}
	document.getElementById(nav_name).className = "nav_mainOn";
}

function HNavClick(nav_name, pre, num) {
	for (i=1; i<=num; i++) {
		if(document.getElementById(pre+i).className = "nav_leftClick") {
			document.getElementById(pre+i).className = "nav_leftOff" ;
		}
	}
	document.getElementById(nav_name).className = "nav_leftClick";
	last_nav_name = nav_name;
}