// toggle display visibility

function hide( targetId ){
 	 if (document.getElementById){
  		target = document.getElementById( targetId );
  				target.style.visibility = "hidden";
  			}
  		}
		
function show( targetId ){
 	 if (document.getElementById){
  		target = document.getElementById( targetId );
  				target.style.visibility = "visible";
  			}
  		}
		
function none( targetId ){
 	 if (document.getElementById){
  		target = document.getElementById( targetId );
  				target.style.display = "none";
  			}
  		}
		
function block( targetId ){
 	 if (document.getElementById){
  		target = document.getElementById( targetId );
  				target.style.display = "block";
			
			}
  		}