function searchChg(cat) {
	switch(cat) {
		case 'cm':
			document.getElementById('menu-cm').className = 'on';
			document.getElementById('menu-tv').className = 'off';
			document.getElementById('menu-movie').className = 'off';
			document.getElementById('menu').value = 'cm';
			break;

		case 'tv':
			document.getElementById('menu-cm').className = 'off';
			document.getElementById('menu-tv').className = 'on';
			document.getElementById('menu-movie').className = 'off';
			document.getElementById('menu').value = 'tv';
			break;

		case 'movie':
			document.getElementById('menu-cm').className = 'off';
			document.getElementById('menu-tv').className = 'off';
			document.getElementById('menu-movie').className = 'on';
			document.getElementById('menu').value = 'movie';
			
			break;
	}
}