function showParagraaf(id)
{
	//function for showing and hiding div's (or other elements)
	var Element = document.getElementById(id);
	var ElementTitel = document.getElementById("titel_" + id)
	
	if (Element.style.display == "none")
	{
		//show the element
		Element.style.display = "block";
		ElementTitel.className = "expanded";
		
	} else {
		//hide the element
		Element.style.display = "none";
		ElementTitel.className = "collapsed";
	}
}