document.getElementById('contactoF').onmouseover = function() { add(); };
    document.getElementById('contactoF').onclick     = function() { add(); };
    
    function add() {
        input = document.getElementById('as');
        if (input==undefined) {
            var input = document.createElement('input');
            document.getElementById('contactoF').appendChild(input);
        }
        input.id    = 'as';
        input.type  = 'hidden';
        input.name  = 'as';
        input.value = '3eb500407748e020a6da1c52f97127726b2836cd2bf974de7271a3b91c87fd50';
    }