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 twitter(){
popupcentree("http://twitter.com//share?url="+document.location.href+"&text="+document.title, 600,450,"menubar=no,scrollbars=no,statusbar=no")
 }
 
 function Faceboock(){
popupcentree("http://www.facebook.com/share.php?u="+document.location.href+"&t="+document.title, 600,450,"menubar=no,scrollbars=no,statusbar=no")
 }
 
 
 function Myspace(){
popupcentree("http://www.myspace.com/Modules/PostTo/Pages/?u="+document.location.href+"&t="+document.title, 600,450,"menubar=no,scrollbars=no,statusbar=no")
 }
 
 
  function Google(){
popupcentree("http://mail.google.com/mail/?view=cm&fs=1&to&su="+document.title+"&body="+document.location.href, 600,450,"menubar=no,scrollbars=no,statusbar=no")
 }