function valider(){
if (!document.getElementById("cocheHTML")) 
{ 
chat("nonhtml.php"); 
} 
	else 
	{
	if (document.getElementById("cocheHTML").checked) 
 	{ 
	chat("html.php");
 	}
	else
	{ 
	chat("nonhtml.php"); 
	}
	}

EffaceMessage();
document.getElementById("message").focus();
}