function activateDSTBox(timeZone) {
	var checkbox = document.getElementById("isDST");
			
	switch (timeZone) {
		case '0':
        case '1':
        case '2':
        case '3':
        case '6':
        case '9':
        case '12':
        case '13':
        case '15':
        case '17':
        case '21':
        case '25':
        case '26':
        case '32':
        case '36':
        case '38':
        case '40':
        case '42':
        case '44':
        case '46':
        case '48':
        case '49':
        case '50':
        case '52':
        case '53':
        case '54':
        case '55':
        case '57':
        case '59':
        case '60':
        case '61':
        case '62':
        case '63':
        case '66':
        case '67':
        case '69':
        case '72':
        case '74':
        case '75':
			checkbox.disabled = true;
			checkbox.checked = false;
			break;
        default:
        	checkbox.checked = true;
        	checkbox.disabled = false;
			break;
	}
     
	return true
}