function forum_center_calque(nom_calque) {
    largeur_calque=450;
    hauteur_calque=200;
    //opera Netscape 6 Netscape 4x Mozilla
    if (window.innerWidth || window.innerHeight){
	    docwidth = window.innerWidth;
	    docheight = window.innerHeight;
    }
    //IE Mozilla
    if (document.body.clientWidth || document.body.clientHeight){
	    docwidth = document.body.clientWidth;
	    docheight = document.body.clientHeight;
    }
    document.getElementById(nom_calque).style.left=parseInt((docwidth-largeur_calque)/2);
    document.getElementById(nom_calque).style.top=parseInt((docheight-hauteur_calque)/2);
    //document.getElementById(nom_calque).style.top=10;
}

function Agrandie(num,legende,larg,haut,id_photo) {
	if(haut>700) {
		rapport=700/haut;
		haut=haut*rapport;
		larg=larg*rapport;
		}
	if(larg<450) {haut2=haut+30;} else {haut2=haut+20;}

   browser=window.open('details_photo.php?numero='+num+'&legende='+legende+'&largeur='+larg+'&hauteur='+haut+'&id_photo='+id_photo,'','width='+larg+',height='+haut2);
   window.onerror = null;
   browser.moveTo ((screen.availWidth )/2-250,20);
   browser.focus();
}