// toggle visibility 

function toggle( targetId,itemNo,ref ){
	
  if (document.getElementById){

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