function nd(){}
function overlib(){}

function checkBox(id){
    obj = document.getElementById(id)
    if(obj.checked){
	obj.checked = false;
    } else {
	obj.checked = true;
    }
}
function doCheckBoxes(){
    var selected = "";
    var boxes = document.getElementsByTagName('input');

    for ( i = 0; i < boxes.length; i++ ){
	if ( boxes[i].checked ){
	    selected += boxes[i].value + ',';

	}
    }
    if(selected.length > 2000) alert(selected.length);
    //remove the last comma
    selected = selected.substr(0,selected.length-1);
    var url = "/cgi-bin/fpa_request.pl?"+selected;
    parent.window.location = url;
}

function checkAll(){
    var boxes = document.getElementsByTagName('input');
    for ( i = 0; i < boxes.length; i++ ){
	boxes[i].checked = true;
    }
}

function checkNone(){
    var boxes = document.getElementsByTagName('input');
    for ( i = 0; i < boxes.length; i++ ){
	boxes[i].checked = false;
    }
}

function checkInverse(){
    var boxes = document.getElementsByTagName('input');
    for ( i = 0; i < boxes.length; i++ ){
	boxes[i].checked = !boxes[i].checked;
    }
}

function checkSubmit(){
    var boxes = document.getElementsByTagName('input');
    for ( i = 0; i < boxes.length; i++ ){
	if(boxes[i].checked){
	    return true;
	}
    }

	alert("No stations selected.\nPlease select stations by checking the box in the first column of the station list");
	return false;
}