function efface_me(obj,init)
{
if (obj.value==init) obj.value='';	

}
function val_nom()
{
if(document.getElementById("name").value=="" ||  document.getElementById("name").value=="Nom")
{
document.getElementById("name_error").style.display="inline";
return false;
}
else
{
document.getElementById("name_error").style.display="none";	
return true;
}
}
function val_mess()
{
if(document.getElementById("message_text").value=="" ||  document.getElementById("message_text").value=="Message")
{
document.getElementById("message_text_error").style.display="inline";
return false;
}
else
{
document.getElementById("message_text_error").style.display="none";	
return true;
}	
}
function valide_mail()
{
var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
var address = document.getElementById("email").value;
if(reg.test(address) == false) {
document.getElementById("email_error").style.display="inline";
return false;
}
else
{
document.getElementById("email_error").style.display="none";
return true;
}
}

function valideform()
{
if(valide_mail() && val_nom() && val_mess())
{ return true;} else {return false;}
}