// toggle nav visibility 

function toggle( targetId,ref ){
	
  if (document.getElementById){
	  
  		var target = document.getElementById( targetId);
			var myRef = document.getElementById( ref );
		
  			if (target.style.display == "none"){
  				target.style.display = "";
					myRef.className = "selected";
  			} else {
  				target.style.display = "none";
					myRef.className = "deselected";
  			}
  }
}