function limitText(limitField, limitNum) {
    if (limitField.value.length > limitNum) {
        limitField.value = limitField.value.substring(0, limitNum);
    } 
}

function onKeyNumeric(e) {
	// Accetto solo numeri,								backspace, 				tab,				canc,			  freccia sx,		  freccia dx
	/*if ( ((e.keyCode >= 48) && (e.keyCode <= 57)) || (e.keyCode == 8) || (e.keyCode == 9) || (e.keyCode == 46) || (e.keyCode == 37) || (e.keyCode == 39) ) {
		return true;
	} else {
		return false;
	}
	*/
	return true;
}