function showvalue(v_in, v_out, v_ret, v_max) {
	document.getElementById(v_out).innerHTML = document.getElementsByName(v_ret)[0].value = v_del1 = v_del2 = v_count = '';
	v_to = document.getElementsByName(v_in)[0].length;
	for(i = 0; i < v_to; i ++) {
		if(document.getElementById(v_out).innerHTML != '') v_del1 = ' / ';
		if(document.getElementsByName(v_ret)[0].value != '') v_del2 = '.';
		if(document.getElementsByName(v_in)[0].options[i].selected) {
			if(v_count < 3) {
				document.getElementById(v_out).innerHTML = document.getElementById(v_out).innerHTML + v_del1 + document.getElementsByName(v_in)[0].options[i].text;
				document.getElementsByName(v_ret)[0].value = document.getElementsByName(v_ret)[0].value + v_del2 + document.getElementsByName(v_in)[0].options[i].value;
			} else {
				if(v_count == 3) alert('wybrać można maksymalnie ' + v_max + ' pozycje');
				document.getElementsByName(v_in)[0].options[i].selected = false;
			}
			v_count ++;
		}
	}
	if(!document.getElementById(v_out).innerHTML) document.getElementById(v_out).innerHTML = '&nbsp;';
}