function section_highlight(menuid){
	var menuitem = document.getElementById(menuid);
	menuitem.style.backgroundColor = "yellow";
	menuitem.style.color = "black";
	menuitem.style.borderColor = "black";
}

function section_unhighlight(menuid){
	var menuitem = document.getElementById(menuid);
	menuitem.style.backgroundColor = "#FFDF4C";
	menuitem.style.color = "black";
	menuitem.style.borderColor = "#FFDF4C";

}

function cs_content_highlight(menuid){
	var menuitem = document.getElementById(menuid);
	menuitem.style.backgroundColor = "#2A3B6F";

}

function cs_content_unhighlight(menuid){
	var menuitem = document.getElementById(menuid);
	menuitem.style.backgroundColor = "#0D1736";

}

function cs_change_content(contentid){
	var content_item = document.getElementById(contentid);
	
	//hide all
	for (i=1;i<5;i++)
	{	
		content_element = "content_" + i;
		var contentitem = document.getElementById(content_element);
		contentitem.style.visibility = "hidden";
	}

	// show content
	content_item.style.visibility = "visible";
}