function displayNav(id){
var newId = "nav_"+id;

if(document.getElementById)	 
	for(i=1; i<6; i++){
		//turn off all layers
		document.getElementById("nav_"+i).style.display = "none";
	}
	//toggle active element
	if(elm = document.getElementById(newId)){
		if(document.getElementById(newId)){
			if(document.getElementById(newId).style.display == "none"){
				document.getElementById(newId).style.display = "block";
			}else{
				document.getElementById(newId).style.display = "none";
			}
		}
	}
}

function switchImage(imgName, imgSrc) 
{
  if (document.images)
  {
    if (imgSrc != "none")
    {
      document.images[imgName].src = imgSrc;
    }
  }
}

section = 0;
function setSection(id){
	section = id;
	displayNav(id);
}

function resetNav(){
	displayNav(section);
}