Décalage entre IE/Firefox et Google Chrome

// avatar
echo '<img class="avatar" src="avatar/none.png" />';

// formulaire de connexion
?>
<form method="post" action="connexion.php">
	<input type="text" name="pseudo" value='Pseudo' size="19" class="login" onFocus="if(this.value=='Pseudo')this.value=''" />
	<input type="password" name="mdp" value='Mot de passe' size="19" class="mdp" onFocus="if(this.value=='Mot de passe')this.value=''" />
	<input type="checkbox" name="cookie" id="cookie" checked="checked" class="connexion_auto" /><label class="connexion_auto_label" for="cookie">Connexion automatique</label>
	<input src="bouton-go.png" type="image" value="submit" name="valider" class="go" />
</form>
<span class="lien_connexion"><a href="creer_compte.php"><font color="white">S'inscrire</font></a> | <a href="retrouver_compte.php"><font color="white">Identifiants oubliés</font></a></span>
<?php

<form class="formulaire_recherche" method="post" action="recherche.php">
<select name="type" class="formulaire_recherche_select"><option value="individu">individu</option><option value="organisation">organisation</option><option value="pays">pays</option><option value="dossier">thème</option></select>
<input type='texte' name='recherche' class="formulaire_recherche_input" value=' Recherche' onFocus="if(this.value==' Recherche')this.value=''" />
<input type="submit" class="formulaire_recherche_submit" value="GO" name="go" />
</form>

/* Généralités */

body
{
	width: 960px;
	margin: auto;
	margin-top: 15px; 
	margin-bottom: 15px;
	font-family: "Trebuchet MS", serif;
	font-size: 15px;
	background-image: url("background-newspaper.gif");
}

a
{
	text-decoration: none;
}

a:visited
{
	color: blue;
}

.msg_erreur
{
	color: #f60909;
}

/* Blocks composants le design */

#menu-haut
{
	width: 960px;
	height: 30px;
}

#banniere
{
	width: 960px;
	height: 150px;
	background-image: url("banniere2.jpg");
	background-repeat: no-repeat;
}

#menu-bas
{
	width: 960px;
	height: 47px;
	background-image: url("recherche.png");
	background-repeat: no-repeat;
}

#corps-haut
{
	width: 960px;
	height: 47px;
	text-align: right;
}

#corps
{
	width: 940px;
	padding: 8px;
	border: 2px solid #000000;
	background-color: #ffffff;
}

/* Espace membre */

.avatar
{
	position: relative;
	left: 650px;
	top: 25px;
}

/* Espace membre : non-connecté */

.login
{
	position: relative;
	left: 768px;
	bottom: 121px;
}

.mdp
{
	position: relative;
	left: 623px;
	bottom: 85px;
}

.connexion_auto
{
	position: relative;
	left: 474px;
	bottom: 51px;
}

.connexion_auto_label
{
	color: #ffffff;
	font-size: 13px;
	position: relative;
	left: 477px;
	bottom: 52px;
}

.go
{
	position: relative;
	left: 467px;
	bottom: 80px;
}

.lien_connexion 
{
	color: #ffffff;
	font-size: 13px;
	position: relative;
	left: 765px;
	bottom: 47px;
}

/* Espace membre : connecté */

.pseudo
{
	color: #ffffff;
}

/* Formulaire de recherche (menu-bas) */

.formulaire_recherche
{
	position: relative;
	top: 9px;
	left: 14px;
}

.formulaire_recherche_select
{
	font-family: "Trebuchet MS", serif;
	font-weight: bold;
	font-size: 15px;
   	border: 2px solid #ffffff;
	background-color: #000000;
	color: #ffffff;
}

.formulaire_recherche_input
{
	font-family: "Trebuchet MS", serif;
	font-weight: bold;
	font-size: 15px;
	border: 2px solid #ffffff;
	background-color: #000000;
	color: #ffffff;
}

.formulaire_recherche_submit
{
	font-family: "Trebuchet MS", serif;
	font-weight: bold;
	font-size: 15px;
}