var xmlhttp, bkghttp, NOAAyrhttp, NOAAhttp;

//=============================================================================
function GetXmlHttpObject()
{
if (window.XMLHttpRequest)
  {
  // code for IE7+, Firefox, Chrome, Opera, Safari
  return new XMLHttpRequest();
  }
if (window.ActiveXObject)
  {
  // code for IE6, IE5
  return new ActiveXObject("Microsoft.XMLHTTP");
  }
return null;
}

//===============================================================================
function SelectionValue(SelName)
{
res = -1;
ele=document.getElementById(SelName);
if (ele !== null){
  res = ele.value;
}
return res;

}
function SelectionInner(SelName)
{
res = -1;
ele=document.getElementById(SelName);
if (ele !== null){
  res = ele.innerHTML;
}
return res;

}

//=====================================================================================
function showNOAAyr(str)
{

NOAAyrhttp=GetXmlHttpObject();
if (NOAAyrhttp==null)
  {
  alert ("Browser does not support HTTP Request");
  return;
  }
  

//mth = SelectionValue ("IDmonth"+str);
yr = SelectionValue ("IDyear"+str);
  
  
var url="getNOAA_yr.php";
url=url+"?year="+yr;


url=url+"&sid="+Math.random();
NOAAyrhttp.onreadystatechange=NOAAyrChanged;
NOAAyrhttp.open("GET",url,true);
NOAAyrhttp.send(null);
}

function NOAAyrChanged()
{
if (NOAAyrhttp.readyState==4)
{
document.getElementById("preview").innerHTML=NOAAyrhttp.responseText;
}
}


//=============================================================================

function showNOAA(str)
{

NOAAhttp=GetXmlHttpObject();
if (NOAAhttp==null)
  {
  alert ("Browser does not support HTTP Request");
  return;
  }
  

mth = SelectionValue ("IDmonth"+str);
yr = SelectionValue ("IDyear"+str);
  
  
var url="getNOAA.php";
url=url+"?month="+mth;
url=url+"&year="+yr;


url=url+"&sid="+Math.random();
NOAAhttp.onreadystatechange=NOAAChanged;
NOAAhttp.open("GET",url,true);
NOAAhttp.send(null);
}

function NOAAChanged()
{
if (NOAAhttp.readyState==4)
{
document.getElementById("preview").innerHTML=NOAAhttp.responseText;
}
}