// this function is needed to work around 
  // a bug in IE related to element attributes
  function hasClass(obj) {
     var result = false;
     if (obj.getAttributeNode("class") != null) {
         result = obj.getAttributeNode("class").value;
     }
     return result;
  }   

function lastTD(_id) {
    var trs = document.getElementsByTagName("tr");
	for (var i=0;i<trs.length;i++){
		var tds = trs[i].getElementsByTagName("td");

		if(tds.length > 0){
			tds[tds.length-1].className += ' last';
		} else {
			tds.className += ' last';
		}
	}
}