function ChangeLang(Lang)
{
	srcInit=this.location.href;
	i= srcInit.indexOf('_')
	x= srcInit.substring(0,i);
	y=srcInit.substring(i+3,srcInit.length);
	NomPage=x+"_"+Lang+y;	
	this.location.href=NomPage;
};

function is_email(email)
  {
     var reg = /^[a-zA-Z0-9._-]+@[a-zA-Z0-9._-]{2,}[.][a-zA-Z0-9]{2,4}$/
     var reg2 = /[.@]{2,}/
     return ((reg.exec(email)!=null) && (reg2.exec(email)==null))
 }