function load_div(id)
{
	close_div();
	document.getElementById(id).style.display = 'block';
	put_opacity(id);
}

function close_div()
{
	var all_div = ['tchat', 'twitter', 'codes', 'mail', 'link'];

	for(var i = 0; i++; i < all_div.length)
	{
		var elem = all_div[i];
                var elem_actuel = document.getElementById(elem);
		if(elem_actuel.style.opacity == 1 && elem_actuel.style.display == 'block')
		{
			elem_actuel.style.opacity = 0.0;
			elem_actuel.style.display = 'none';

			return true;
		}
	}
}
function put_opacity(id)
{
	var elem = document.getElementById(id), op = 0.0;

	if(elem.style.opacity == 1)
	{
		return true;
	}
	else
	{
		op = parseFloat(elem.style.opacity);
		elem.style.opacity = (op + 0.1);
	}
	setTimeout(function (){put_opacity(id)}, 100);
}