function changeBg(imageName,rep,cssId){
	document.getElementById(cssId).style.backgroundImage = 'url(images/fonds/fd'+imageName+'.jpg)';
}

function Controle(){
if (document.form_contact.nom.value==""){
alert("Veuillez saisir votre nom");
document.form_contact.nom.focus()
return false;
}
if (document.form_contact.email.value == "" || document.form_contact.email.value.indexOf('@', 0) == -1 || document.form_contact.email.value.indexOf('.', 0) == -1)
{
window.alert("Vous devez saisir une adresse e-mail valide");
document.form_contact.email.focus()
return false;
}
if (document.form_contact.message.value==""){
alert("Veuillez saisir un message");
document.form_contact.message.focus()
return false;
}
} 

function ControleGB(){
if (document.form_contact.nom.value==""){
alert("Please enter your Surname");
document.form_contact.nom.focus()
return false;
}
if (document.form_contact.email.value == "" || document.form_contact.email.value.indexOf('@', 0) == -1 || document.form_contact.email.value.indexOf('.', 0) == -1)
{
window.alert("Please enter a valid email adress");
document.form_contact.email.focus()
return false;
}
if (document.form_contact.message.value==""){
alert("Please enter a message");
document.form_contact.message.focus()
return false;
}
}