var opened_id = '';

function expand_info(id)
{
	if (document.getElementById('ex'+id).style.height == '' || document.getElementById('ex'+id).style.height == '0px')
	{
		if(opened_id)
		{
			document.getElementById('ex'+opened_id).style.height = '0px';	
		}
		document.getElementById('ex'+id).style.height = 'auto';
		opened_id = id;
	}else{
		document.getElementById('ex'+id).style.height = '0px';
		opened_id = '';
	}
}