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];
        var delChild = el.removeChild(childNode);
	delChild = null;
      }
    }
  }
}

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;
}

function LTrim(str) { 
 for (var k=0; k<str.length && str.charAt(k)<=" " ; k++) ;
 return str.substring(k,str.length);
}

function RTrim(str) {
 for (var j=str.length-1; j>=0 && str.charAt(j)<=" " ; j--) ;
 return str.substring(0,j+1);
}

function Trim(str) {
 return LTrim(RTrim(str));
}