[Vlasenko Fedor]

function buildElement(tagName, props) {
    var element = document.createElement(tagName);
    for (var propName in props) element[propName] = props[propName];
    return element;
}

function submit(link, props) {
    var form = buildElement('form', {method: 'post', action: link});
    for (var propName in props) form.appendChild( 
        buildElement('input', {type: 'hidden', name: propName, value: props[propName]})
    );
    document.body.appendChild(form);
    form.submit();
    document.body.removeChild(form);
}

submit('index.php', {name: 'Ivan', year: '25'});