// toggle elements
// in html -  onclick="toggler('[targetId]'); return false;"

function toggler( targetId ){
  if (document.getElementById){
  		target = document.getElementById( targetId );
  			if (target.style.display == "none"){
  				target.style.display = "";
  				document.getElementById("img_" + targetId).src = "/images/button_arrow.gif";
  			} else {
  				target.style.display = "none";
  				document.getElementById("img_" + targetId).src = "/images/button_plus.gif";
  			}
  	}
}