var arGageList=new Array(
"NE","0604","Abingdon","VA","USGS",
"ECB","0921","Albany","KY","COE",
"SW","0072","Albertville","AL","TVA",
"SW","0531","Anderson","TN","TVA",
"WCB","1132","Antioch","TN","COE",
"EC","0121","Apalachia Dam Powerhouse","TN","TVA",
"NE","0342","Appalachia","VA","TVA",
"EC","0333","Arthur","TN","USGS",
"E","0267","Asheville","NC","USGS",
"SW","0062","Athens","AL","TVA",
"EC","0428","Athens","TN","TVA",
"NE","0299","Banner Elk","NC","TVA",
"ECB","0923","Barbourville","KY","COE",
"WCB","1162","Barkley Dam Tailwater","KY","COE",
"E","0268","Beetree Dam","NC","USGS",
"WCB","1139","Bellevue","TN","USGS",
"W","0635","Benton","KY","TVA",
"WCB","0926","Bethpage","TN","COE",
"EC","0699","Big Lick","TN","TVA",
"ECB","0896","Billows","KY","COE",
"WCB","0931","Bledsoe Creek","TN","COE",
"SE","0110","Blue Ridge Dam","GA","TVA",
"NE","0258","Boone","NC","TVA",
"NE","0707","Boone Dam","TN","TVA",
"E","0285","Brevard","NC","USGS",
"W","0457","Bruceton","TN","TVA",
"SE","0185","Bryson City","NC","USGS",
"EC","0785","Bull Run Fossil","TN","USGS",
"NE","0741","Burbank","TN","TVA",
"ECB","0908","Burkesville","KY","COE",
"ECB","0697","Byrdstown","TN","COE",
"SE","0177","Cades Cove","TN","TVA",
"WCB","0764","Cadiz","KY","COE",
"WCB","0911","Canton","KY","COE",
"E","0250","Canton","NC","USGS",
"WCB","1138","Carthage","TN","COE",
"SW","2043","Cedar Creek","AL","TVA",
"ECB","1136","Celina","TN","COE",
"WCB","0925","Center Hill Dam","TN","COE",
"W","0446","Centerville","TN","TVA",
"EC","0098","Charleston","TN","TVA",
"SW","0365","Chase","AL","TVA",
"SE","0744","Chatuge Dam","NC","TVA",
"WCB","0892","Cheatham Dam","TN","COE",
"SE","0186","Cherokee","NC","TVA",
"NE","0489","Cherokee Dam","TN","TVA",
"EC","0568","Chickamauga GA","GA","TVA",
"SE","0570","Choestoe","GA","TVA",
"E","0219","Chuckey","TN","TVA",
"NE","0292","Church Hill","TN","TVA",
"WCB","0526","Clarksville","TN","COE",
"EC","0429","Cleveland","TN","TVA",
"W","0453","Clifton City","TN","TVA",
"WC","0880","Coalmont","TN","TVA",
"WCB","0912","Cobb","KY","COE",
"NE","0740","Coeburn","VA","TVA",
"SW","0648","Collinwood","TN","TVA",
"W","0248","Columbia","TN","TVA",
"ECB","0706","Cookeville","TN","COE",
"SE","0735","Coosa River","GA","USGS",
"SE","0107","Copperhill","TN","TVA",
"ECB","0893","Corbin North","KY","COE",
"ECB","0898","Corbin South","KY","COE",
"ECB","0890","Cordell Hull Dam","TN","COE",
"E","0538","Cosby","TN","TVA",
"EC","0163","Crab Orchard","TN","TVA",
"EC","0420","Dayton","TN","TVA",
"ECB","0434","De Rossett","TN","TVA",
"EC","0148","Decatur","TN","TVA",
"E","0719","Del Rio","TN","TVA",
"SE","0218","Dial","GA","TVA",
"SW","0360","Dime","AL","TVA",
"E","0593","Douglas Dam","TN","TVA",
"WCB","0602","Dover","TN","COE",
"NE","0348","Duffield","VA","TVA",
"EC","0086","Dunlap","TN","TVA",
"SW","0691","Dunn","TN","TVA",
"WCB","0901","Elkton","KY","COE",
"WC","0128","Elkton","TN","TVA",
"WCB","1133","Ellis Mills","TN","USGS",
"E","0220","Embreeville","TN","USGS",
"EC","0117","Etowah","TN","TVA",
"SW","0384","Falkville","AL","TVA",
"ECB","0436","Falls Creek","TN","TVA",
"WC","0058","Fayetteville","TN","USGS",
"EC","0337","Fitts Gap","TN","TVA",
"SW","0387","Flat Rock","AL","TVA",
"SE","0592","Fontana Dam","NC","TVA",
"EC","0490","Fort Loudoun Dam","TN","TVA",
"SE","0198","Franklin","NC","USGS",
"WCB","0734","Franklin","TN","COE",
"ECB","0928","Gainesboro","TN","COE",
"SE","0209","Gatlinburg","TN","TVA",
"EC","0094","Georgetown","TN","TVA",
"ECB","0902","Gray Hawk","KY","COE",
"ECB","0088","Great Falls Dam","TN","TVA",
"SE","0720","Grizzle Creek","GA","TVA",
"SW","0138","Grove Oak","AL","TVA",
"SW","0070","Guntersville Dam","AL","TVA",
"SW","0386","Henagar","AL","TVA",
"E","0279","Hendersonville","NC","USGS",
"SE","0571","Higdons Store","GA","TVA",
"SE","0201","Highlands","NC","USGS",
"NE","0794","Hiltons","VA","TVA",
"SE","0125","Hiwassee Dam","NC","TVA",
"SW","0480","Hodges","AL","TVA",
"W","0018","Hohenwald","TN","TVA",
"SW","0401","Holcut","MS","TVA",
"WCB","0006","Hopkinsville","KY","COE",
"WCB","0929","Hunters Point","TN","COE",
"SW","0369","Iron City","TN","USGS",
"EC","0800","Isoline","TN","TVA",
"ECB","0698","Jamestown","TN","COE",
"EC","0884","Jena","TN","TVA",
"NE","0727","John Sevier Fossil","TN","TVA",
"W","0017","Johnsonville","TN","USGS",
"W","0379","Kentucky Dam","KY","TVA",
"EC","0712","Kingston Fossil","TN","TVA",
"WCB","0894","Kingston Springs","TN","COE",
"EC","0207","Knoxville","TN","TVA",
"NE","0732","Konnarock","VA","USGS",
"WCB","0924","Lafayette","TN","COE",
"WCB","0895","Lascassas","TN","COE",
"NE","0309","Laurel Bloomery","TN","TVA",
"WCB","0455","Lebanon","TN","COE",
"NE","0316","Lebanon VA","VA","USGS",
"E","0262","Leicester","NC","USGS",
"W","0158","Lexington","TN","TVA",
"SW","0078","Lim Rock","AL","TVA",
"ECB","0913","Livingston","TN","COE",
"W","0023","Lobelville","TN","USGS",
"EC","0508","Luttrell","TN","TVA",
"WC","0208","Manchester","TN","TVA",
"SE","0140","Marble","NC","TVA",
"NE","0312","Marion","VA","USGS",
"EC","0095","McDonald","TN","TVA",
"W","0728","McEwen","TN","TVA",
"ECB","0087","McMinnville","TN","USGS",
"EC","0770","Melton Hill Dam","TN","TVA",
"ECB","1144","Middlesboro","KY","COE",
"W","0463","Milledgeville","TN","TVA",
"NE","0686","Milligan College","TN","TVA",
"ECB","0165","Monterey","TN","COE",
"ECB","0903","Monticello","KY","COE",
"ECB","0440","Morrison","TN","TVA",
"NE","0290","Morristown","TN","TVA",
"SW","0381","Moulton","AL","TVA",
"E","0233","Mount Mitchell","NC","USGS",
"W","0447","Mount Pleasant","TN","TVA",
"WCB","0027","Murfreesboro","TN","COE",
"SE","0136","Murphy","NC","TVA",
"SE","0194","Needmore","NC","USGS",
"ECB","0914","Newcomb","TN","COE",
"SE","0819","Newfound Gap","TN","TVA",
"E","0241","Newport","TN","USGS",
"SW","0788","Nickajack Dam","TN","TVA",
"E","0658","Nolichucky Dam","TN","TVA",
"WC","0857","Normandy","TN","TVA",
"EC","0323","Norris Dam","TN","TVA",
"NE","0495","North Bristol","VA","TVA",
"SE","0573","Nottely Dam","GA","TVA",
"E","0211","Oak Grove","TN","TVA",
"WCB","0891","Old Hickory Dam","TN","COE",
"ECB","0917","Oneida","TN","COE",
"WCB","0916","Orlinda","TN","COE",
"NE","0645","Pandora","TN","USGS",
"W","0456","Paris Landing","TN","TVA",
"SE","0099","Parksville","TN","TVA",
"W","0015","Parsons","TN","TVA",
"WC","0060","Pelham","TN","USGS",
"ECB","1134","Penitentiary Branch","TN","COE",
"NE","0340","Pennington Gap","VA","TVA",
"WC","0383","Petersburg","TN","TVA",
"EC","0167","Petros","TN","TVA",
"W","0037","Pickwick Dam","TN","TVA",
"EC","0768","Pikeville","TN","TVA",
"ECB","0904","Pineville","KY","COE",
"E","0237","Plumtree","NC","TVA",
"WCB","0016","Port Royal","TN","COE",
"WC","0030","Prairie Plains","TN","USGS",
"SE","0004","Presley","GA","TVA",
"WC","0797","Pulaski","TN","TVA",
"EC","0721","R. H. Bandy","GA","TVA",
"EC","0834","Raccoon Mtn","TN","TVA",
"E","0402","Relief","NC","USGS",
"NE","0353","Richlands","VA","USGS",
"ECB","1145","Robbins","TN","USGS",
"EC","0157","Roddy","TN","TVA",
"E","0286","Rosman","NC","USGS",
"WC","0585","Salem","TN","TVA",
"NE","0318","Saltville","VA","USGS",
"E","0672","Sams Gap","NC","TVA",
"W","0034","Savannah","TN","TVA",
"SW","0168","Scottsboro","AL","TVA",
"SE","0642","Sevierville","TN","TVA",
"WC","0084","Sewanee","TN","TVA",
"WC","0773","Shelbyville","TN","USGS",
"NE","0597","South Holston Dam","TN","TVA",
"ECB","0905","Somerset","KY","COE",
"EC","0326","Speedwell","TN","TVA",
"WCB","0919","Springfield","TN","COE",
"WCB","0920","Statesville","TN","COE",
"ECB","0897","Stearns","KY","COE",
"SE","0179","Stratton Meadows","TN","TVA",
"EC","0427","Sweetwater","TN","TVA",
"SE","0543","Sylva","NC","USGS",
"NE","0357","Tazewell","VA","USGS",
"EC","0174","Tellico Plains","TN","TVA",
"WCB","1137","Temperance Hall","TN","COE",
"WC","0827","Tims Ford Dam","TN","TVA",
"SE","0574","Titus","GA","TVA",
"SW","0866","Town Creek","AL","TVA",
"NE","0609","Trade","TN","TVA",
"WC","0026","Unionville","TN","TVA",
"SE","0600","Wallace Gap","NC","USGS",
"E","0256","Walnut","NC","TVA",
"E","0244","Walters Dam","NC","USGS",
"EC","0736","Wartburg","TN","TVA",
"EC","0673","Washburn","TN","TVA",
"NE","0596","Watauga Dam","TN","TVA",
"EC","0421","Watts Bar Dam","TN","TVA",
"W","0019","Waynesboro","TN","TVA",
"SE","0249","Waynesville","NC","USGS",
"SW","0052","Wheeler Dam","AL","TVA",
"SW","0739","Whitesburg","AL","USGS",
"SW","0085","Whitwell","TN","TVA",
"SW","0704","Widows Creek Fossil","AL","TVA",
"SE","0228","Wildwood","TN","TVA",
"ECB","0899","Williamsburg","KY","USGS",
"SW","0471","Wilson Dam","AL","TVA",
"WCB","0737","Woodbury","TN","COE",
"SW","0045","Wright","AL","TVA",
"E","0226","Yancey","NC","TVA",
"SE","0146","Young Harris","GA","TVA");
var arTimePeriodsList=new Array(
"Please Select", "0",
"March 2010", "201003",
"February 2010", "201002",
"January 2010", "201001");
function LoadGagesSelect() {
  var objForm=document.EXTRACTDATA;
  // Determine the selected region.
  var objSelectState = objForm.STATES;
  var intIndex = objSelectState.selectedIndex;
  var txtState = objSelectState.options[intIndex].value;
  // Clear the options in the gages select box.
  var objSelectGages = objForm.GAGES;
  objSelectGages.options.length = 0;
  // Load the gages select box.
  var intIndex = 0;
  for (var i=0; i<arGageList.length; i=i+5 ) {
    if (arGageList[i+3]==txtState) {
      objSelectGages.options[intIndex] = new Option(arGageList[i+2], arGageList[i+1]);
      objSelectGages.options[intIndex] = new Option(arGageList[i+2]+" ("+arGageList[i+4]+")", arGageList[i+1]);
      intIndex++;
    } else if (txtState=='ALL') {
      objSelectGages.options[intIndex] = new Option(arGageList[i+2]+", "+arGageList[i+3]+" ("+arGageList[i+4]+")", arGageList[i+1]);
      intIndex++;
    }
  }
}
function LoadTimePeriods() {
  var objForm=document.EXTRACTDATA;
  // Clear the options in the time periods select box.
  var objSelectTimePeriod = objForm.RANGE;
  objSelectTimePeriod.options.length = 0;
  // Load the time periods select box.
  var intIndex = 0;
  for (var i=0; i<arTimePeriodsList.length; i=i+2 ) {
    objSelectTimePeriod.options[intIndex] = new Option(arTimePeriodsList[i], arTimePeriodsList[i+1]);
    intIndex++;
  }
  objSelectTimePeriod.options[0].selected=true;
}
function CheckForm() {
  var objForm=document.EXTRACTDATA;
  var objGages = objForm.GAGES;
  var bolFoundSelectedGage = false;
  // Make sure at least one gages was selected
  for (var i=0; i<objGages.options.length; i++) {
    if (objGages.options[i].selected) {
      bolFoundSelectedGage = true;
      break;
    }
  }
  if (!bolFoundSelectedGage) {
    var Msg = "You must select at least one gage\n";
    Msg = Msg+"before you can extract data.";
    alert(Msg);
    return;
  }
  // Make sure the time period was selected.
  var objSelectTimePeriod = objForm.RANGE;
  var intIndex = objSelectTimePeriod.selectedIndex;
  var intValue = objSelectTimePeriod.options[intIndex].value;
  if (intValue < 1) {
    var Msg = "You must select the time period of\n";
    Msg = Msg+"data before you can extract data.";
    alert(Msg);
    return;
  }
  // Make sure the format type was selected.
  var objSelectFormat = objForm.FORMAT;
  var intIndex = objSelectFormat.selectedIndex;
  var intValue = objSelectFormat.options[intIndex].value;
  if (intValue < 1) {
    var Msg = "You must select the data format\n";
    Msg = Msg+"before you can extract data.";
    alert(Msg);
    return;
  }
  objForm.submit();
  return;
}