pb en javascript

<script language=javascript>
function connec()
{
	if(document.log.login.value == "" || document.log.pass.value == "")
	{
		alert("Au moins un des champs est vide");
		return false;
	}
	else
	{
		log.submit();
		return true;
	}
}
</script>
<div class=texte>
<form name=log action="index.php?page=log&action=login" method=post>
Login: <input type=text name=login size=15 maxlength=20/><br/>
Pass: <input type=password name=pass size=15 maxlength=10/><br/>
<input type=button onclick="connec()" value="Connexion"/></form></div>

function check(){

	bton(true);

	if(document.forms['formlogin'].muser.value == ''){
		alert('Indiquez votre nom, SVP.');
		bton(false);
		return false;
	}
	
	if(document.forms['formlogin'].mpassword.value == ''){
		alert('Indiquez votre mot de passe, SVP.');
		bton(false);
		return false;
	}
	

	return true;
}

function bton(t) {
	document.formlogin.bouton.disabled=t; document.formlogin.bouton.value= (t) ? 'Patientez...' : 'connexion' ;
}

<form action="{PATHTO}/membres/login.php" method="post" id="formlogin" name="formlogin" onsubmit="return check()">

<p class="center">Utilisateur :
<input type="text" name="muser" id="muser" maxlength="50" />

Mot de passe :
<input type="password" name="mpassword" id="mpassword" maxlength="8" />
<input type="hidden" name="md5" /></p>

<p class="center"><input type="submit" value="connexion" class="bouton" name="bouton" id="bouton" /></p>

</form>