var ns4 = (document.layers)? true : false;
var ie = (document.all)? true : false;

var HAUT = window.screen.height
var LARG = window.screen.width

function Apercu(img, larg, haut){

var temp = "WIDTH="+ LARG  + ",HEIGHT="+ HAUT + ",resizable,fullscreen,scrollbar"
var fen = window.open ("", "apercu", temp)
//alert ("largeur : "+ LARG + " Hauteur : " + HAUT)

if  (haut > larg){ 
    var l = (HAUT*(parseInt(larg)/100)-30)
    var h =  (HAUT*(parseInt(haut)/100)-40)
}
else{
    var l = (LARG*(parseInt(larg)/100)-30)
    var h =  (LARG*(parseInt(haut)/100)-40)

}

fen.document.write ("<center><a href=javascript:window.close()>Fermer l\'aperçu</a><br></center>")
fen.document.write ("<center><img src='"+ img + "' width="+ l + " height=" + h + "></center>")

}

function Initialiser_page(){
	if (LARG > 800 && self == parent.centre){
	    if (document.all || document.getElementById){
	    
            var text = document.body.background
            document.body.background = text.substr(0, text.length-4) + "g.jpg"	        
	    }
	    else{
	        var text = document.location.href
	        if (document.layers && text.substr(text.length-7, text.length)!= "_g.html"){
	        
	            //alert (text.substr(0,text.length-4) + "_g.html")
	            document.location = text.substr(0,text.length-5) + "_g.html"
	        }
	        
	    }
	}
}