function hide_div(exception)
{
	tab_div = document.getElementsByTagName('div');
	for(i = 0; i < tab_div.length; i++)
	{
		if(tab_div[i].id.substr(0,6) == "hidden")
		{
			if(tab_div[i].id != exception)
			{
				tab_div[i].style.display = "none";
			}
		}
	}
}

function display_div(display_item)
{
	if(document.getElementById(display_item).style.display != 'block')
		document.getElementById(display_item).style.display = 'block';
	else
		document.getElementById(display_item).style.display = 'none';
}