var dist=new sack();
var curToID=false;
var curFromID=false;
var curToTable=false;
var curFromTable=false;

function getDistance(){
 var toID=document.getElementById('to_id').value;
 var fromID=document.getElementById('from_id').value;
 var toTable=document.getElementById('to_table').value;
 var fromTable=document.getElementById('from_table').value;
 if(toID.length!=0 && fromID.length!=0 && toTable.length!=0 && fromTable.length!=0){
  curToID=toID;
  curFromID=fromID;
  dist.requestFile='/include/great-circle.php?id1='+fromID+'&id2='+toID+'&toTable='+toTable+'&fromTable='+fromTable;	// Specify file to get
  dist.onCompletion=showDistance;	// Specify function that will be executed after file has been found
  dist.runAJAX();		// Execute AJAX function			
 }
}

function showDistance(){
 var formObj=document.forms['calc'];
 eval(dist.response);
 if(document.getElementById('from').value==null||document.getElementById('from').value==''){
	document.getElementById('area1').value=null;
	document.getElementById('lat1').value=null;
	document.getElementById('long1').value=null;
	document.getElementById('miles').value=null;
	document.getElementById('km').value=null;
	document.getElementById('naut').value=null;
 }
 if(document.getElementById('to').value==null||document.getElementById('to').value==''){
	document.getElementById('area2').value=null;
	document.getElementById('lat2').value=null;
	document.getElementById('long2').value=null;
	document.getElementById('miles').value=null;
	document.getElementById('km').value=null;
	document.getElementById('naut').value=null;
 }
 document.getElementById('area1').value=document.getElementById('from').value;
 document.getElementById('area2').value=document.getElementById('to').value;
 document.getElementById('showDistance').style.display='block';
 document.getElementById('showLat-Long').style.display='block';
}
    
function reset(){
 document.getElementById('area1').value=null;
 document.getElementById('area2').value=null;
 document.getElementById('lat').value=null;
 document.getElementById('long').value=null;
}

function initFormEvents(){
 document.getElementById('from').setAttribute('autocomplete','off');
 document.getElementById('to').setAttribute('autocomplete','off');
 document.getElementById('from').focus();
}
addLoadEvent(initFormEvents);