Dear Tony I found the solution

Just before I create the grid I use

JQuery(“mygrid”).Gridunload();

and everything works fine thank you for your help

Sorry,

I get a message for javascript error :

object doesn't support this property or methos.

I guess this is caused by

$(”#tabledata1″).setGridParam({datatype:'xmlstring',datastr:mystr}).

triggrer(”reloadGrid”);

because only when I add it to my page I get the error.

Is there some other way to empty the grid each time i puss the button and then fill it?

Thank you Tony,

Please see my code below. Where should I reload the grid?

var xmlHttpdata;
function getMessagedata()
{
//in this panel I have the

document.getElementById(“PanelTable1”).style.display = “inline”;
var persontxt = document.getElementById(“txtasf”).value;
if(window.ActiveXObject)
{
xmlHttpdata=new ActiveXObject(“Microsoft.XMLHTTP”);
}
else if (window.XmlHttpRequest)
{

xmlHttpdata=new XMLHttpRequest();
}
//call my WebService
xmlHttpdata.open(“get”, “http://……?txtname=” + persontxt + “”,true);
xmlHttpdata.onreadystatechange=doUpdatedata;
xmlHttpdata.send(); return false;
}
function doUpdatedata()
{
if(xmlHttpdata.readyState==4)
{
if (xmlHttpdata.status == 200) {
//document.getElementById(“lblHTMLOutput”).innerHTML = “”;
var xmlDocdata =xmlHttpdata.responseXML.xml;
var newmystr = xmlDocdata.toString();
var mystr = xmlDocdata.toString();
//alert(mystr);

$(document).ready(function(){
$(“#tabledata1”).jqGrid({