var el = document.getElementById('makeform');


html_form = '<tr><td>Nom : </td><td><input name="nom" type="text" value="" /></td></tr>';
html_form += '<tr><td>P&eacute;nom : </td><td><input name="prenom" type="text" value="" /></td></tr>';
html_form += '<tr><td>Adresse e-mail : </td><td><input name="mail" type="text" value="" /></td></tr>';
html_form += '<tr><td>T&eacute;l&eacute;phone : </td><td><input name="tel" type="text" value="" /></td></tr>';
html_form += '<tr><td>Message (facultatif) : </td><td><textarea name="mes" rows="5"></textarea></td></tr>';

html_form = '<form action="?formsend" onsubmit="return CheckLikeForm();" name="LikeForm" id="LikeForm" method="post" enctype="multipart/form-data"><table>' + html_form + '</table><p><input type="submit" value="Envoyer"></p></form>';


el.innerHTML = html_form;