/* -----main menu----- */

function toggle(submenu) {
	var mmb = document.getElementById('main-menu-box');
	var mms = mmb.getElementsByTagName('div');
	var smm = document.getElementById(submenu);
	for( var i = 0; i < mms.length; i++ ){
		if(mms[i].className == 'submenu' ) {
			mms[i].style.display = 'none';
			mms[i].style.visibility = 'visible';
		}
	}
	if( smm ){	
		smm.style.display = 'block';
		smm.style.visibility = 'visible';
	}
}