function go()
{
		var user = document.form.user.value;
		var pass = document.form.pass.value;
		if ( user == "" && pass == "" )
		{ 
			alert("Pseudo et/ou mot de passe invalide");
		}
		else 
		{ 
			isfound=false;
			okpass=""
		for (i = 0; i < look.length; i++)
		{ 
		if (user==look[i][0])
				{ 
					okpass=look[i][1];
					isfound=true;
				break; 
				}
		}
		if (okpass=="")
		{ 
			alert("Pseudo et/ou mot de passe invalide");
		}
		else 
		{ 
		if (!isfound) 
		{ 
			alert("Pseudo et/ou mot de passe invalide");
				}
				else 
				{ 
					if (okpass != pass) 
						{ 
							alert("Pseudo et/ou mot de passe invalide");
						} 
						else 
							{ 
								location = '../fr/pdf_fr/fr_pdf.htm';
							}
						}
				}
		}
}