function mover(num) {
	document.getElementById("nav_elem_"+num).className='nav_elem_'+num+'_hover'; 
}

function mout(num) {
	document.getElementById("nav_elem_"+num).className='nav_elem_'+num+'_mout';
}

function shadow(num,side) {
	document.getElementById("shadow_"+num).className='shadow_'+side;
}