function open_gallery(cid, img) {
	
	if(document.all) {
		larg = document.body.clientWidth;
		haut = document.body.scrollTop;
	}
	
	var haut = document.getElementById(cid).scrollTop;
	
	var dest = document.getElementById('open_gallery');
	
	dest.innerHTML = '<img src='+img+' />';
	dest.style.visibility = "visible";
	dest.style.top = Math.floor((haut-450)/2);
	dest.style.left = Math.round((larg-600)/2);
	
	alert(haut + ' ' +dest.style.top);
	
	
}