function windopen(page,taille)
{
	fenetre=window.open(page,"image",taille)
}

function toggle(which)
{
	var element = document.getElementById(which);
	if (element.style.display == 'none')
	{
		element.style.display = 'block';
	}
	else
	{
		element.style.display = 'none';
	}
}

function hide_button()
{
	var button = document.getElementById('submit');
	button.setAttribute('disabled', 'true');
}