var myTimeOut, nPos, nTo, nBy;
function startchw() {
  nPos=(document.getElementById('tblMain').clientWidth);
  nTo=document.body.clientWidth-50;
  nBy=(nTo-nPos)/20;
  myTimeOut = self.setInterval("chw()",40);
}
function chw() {
  var n;
  nPos=nPos+nBy;
  if (nPos > nTo)
    nPos = nTo;
  document.getElementById("tblMain").width = nPos;
  if (nPos >= nTo)
  {
    clearTimeout(myTimeOut);
    document.getElementById('tblMain').width = "100%";
  }
}