function replaceText(el, text)
{
   if(el != null)
   {
      clearText(el);
      var newNode = document.createTextNode(text);
      el.appendChild(newNode);
   }
}

function clearText(el)
{
   if(el != null)
   {
      if(el.childNodes)
      {
         for(var i = 0; i < el.childNodes.length; i++)
         {
            var childNode = el.childNodes[i];
            el.removeChild(childNode);
         }
      }
   }
}

function getText(el)
{
   var text = "";
   if(el != null)
   {
      if(el.childNodes)
      {
         for(var i=0; i<el.childNodes.length; i++)
         {
            var childNode = el.childNodes[i];
            if(childNode.nodeValue != null)
            {
               text = text + childNode.nodeValue;
            }
         }
      }
   }
   return text;
}