function getWeights(group_id) {
     createRequest();  
     var url = "http://www.tkdscotland.com/weight_ajax.php";
	 url=url+"?group_id="+group_id;
     request.open("GET", url, true);
     request.onreadystatechange = updatePage;
     request.send(null);
  }

  function updatePage() {
    if (request.readyState == 4) {
  		if (request.status == 200) {			
  		  var xmlDoc = request.responseXML;  		   	  
  		  var category = xmlDoc.getElementsByTagName("category");    
		  for(j=document.playerweightadd.weightcat.options.length-1;j>=0;j--)
		  {
			document.playerweightadd.weightcat.remove(j);
		  }
		  
		  var optn = document.createElement("OPTION");
		  optn.text = 'Please Select';
		  optn.value = '';
		  document.playerweightadd.weightcat.options.add(optn);			
		  
	      for (var i = 0; i < category.length; i++) { 
          	var weightcatid = category[i].getAttribute("weightcatid");
          	var description = category[i].getAttribute("description");
			
			var optn = document.createElement("OPTION");
			optn.text = description;
			optn.value = weightcatid;
			document.playerweightadd.weightcat.options.add(optn);			
          }       
  		}
    }
  }