function toggleVisibility(div)
	{
		if (document.getElementById(div).style.display!="none")
			document.getElementById(div).style.display="none";
		else
			document.getElementById(div).style.display="block";
	}

	function link(url)
	{
		document.location=url;
	}
	
	function init()
	{	
		toggleVisibility('haztype');
		//toggleVisibility('rrg');
		//toggleVisibility('riskanalysis');
	}