function btnPrevClick()
{
  var intCurrPage;
  
  // --- read the current value of the hidden field
  intCurrPage = parseInt(document.frmpager.HiddenCurrPage.value);  
  // --- set the value to the previous page avoiding negative values
  if(intCurrPage > 1 ) document.frmpager.HiddenCurrPage.value = intCurrPage - 1;  
  // --- submit the form through client side script  
  document.frmpager.submit();
}

function btnNumberClick(varPage)
{
  var intCurrPage;
  
  intCurrPage = parseInt(varPage);  
  document.frmpager.HiddenCurrPage.value = varPage;
  document.frmpager.submit();
}

function btnNextClick()
{
  var intCurrPage;

  // --- read the current value of the hidden field
  intCurrPage = parseInt(document.frmpager.HiddenCurrPage.value);  
  // --- set the value to next page 
  document.frmpager.HiddenCurrPage.value = intCurrPage + 1;
  document.frmpager.submit();
}