function toggle_visibility(id) {
       var e = document.getElementById(id);
       if(e.style.display == 'block')
          e.style.display = 'none';
       else
          e.style.display = 'block';
    }
    
    oldTextAry = new Array();

	function changeText (fieldObj, newTexStr) {
	if (newTexStr == fieldObj.innerHTML) {
	fieldObj.innerHTML = oldTextAry[fieldObj.id];
	} else {
	oldTextAry[fieldObj.id] = fieldObj.innerHTML;
	fieldObj.innerHTML = newTexStr;
	}
	}