function popupcentree(page,largeur,hauteur,options) {     
      var top=(screen.height-hauteur)/2;     
      var left=(screen.width-largeur)/2;     
      window.open(page,"","top="+top+",left="+left+",width="+largeur+",height="+hauteur+","+options); 
  }
  
  function VerifForm(the_form)
	{
	adresse      = document.getElementById('email').value;
	
	var place = adresse.indexOf("@",1);
	var point = adresse.indexOf(".",place+1);
	if ((place > -1)&&(adresse.length >2)&&(point > 1))
		{
		
    my_form = eval(the_form);
    my_form.submit();


		}
	else
		{
		alert('Entrez une adresse e-mail valide !!');
		return false;
		}
	}