function hide_img(){
document.getElementById("infobulle").style.visibility = "hidden";
}

function show_img(img){

var x = document.documentElement.scrollLeft + 200;
var y = document.documentElement.scrollTop + 200;

document.getElementById("infobulle").style.position = "absolute";
document.getElementById("infobulle").style.width = "400px";
document.getElementById("infobulle").style.height = "400px";
document.getElementById("infobulle").style.top = y+"px";
document.getElementById("infobulle").style.left = x+"px";
document.getElementById("infobulle").style.visibility = "visible";

$mystring = 'abc';$findme   = 'a';

var tabURL = img.src.split('petite_');
var newSRC = tabURL[0]+'grande_'+tabURL[1]; 
var image = '<img src="'+newSRC+'" title="'+img.title+'" style="border-width:1px; border-style:solid; border-color:#86CAEF;"/>';

document.getElementById("infobulle").innerHTML = image;

}