var hilight=-1;

image=new Image();

for (l=0;l<layerid.length;l++) {
 img="fov/"+hemisphere+"."+layerid[l]+".png";
 image.src=img;
}

for (n=0;n<stid.length;n++) {
  img="fov/"+stid[n]+".fov.png";
  image.src=img; 
}


function togglelayer(value) {

  for (l=0;l<layerid.length;l++) if (layerid[l]==value) break;

  chkid=layerid[l]+"chk";
  el=document.getElementById(chkid);
  state=el.checked;

  divid=layerid[l]+"div";
  el= document.getElementById(divid);
  if (state==false) el.style.visibility="hidden";
  else el.style.visibility="visible";
}



function toggle(id) {
  
  for (n=0;n<stid.length;n++) if (stid[n]==id) break;
  if (n==stid.length) {
    site.innerHTML="";
    pinvestigator.innerHTML="";
    radardiv.style.visibility="hidden";
    hilight=-1;
    return false;
  } 
 
  document.getElementById("site").innerHTML="<h4>"+stname[n]+" ("+stid[n]+")</h4><pre class=\"txtbox\">"+stloc[n]+"</pre>";
  document.getElementById("pinvestigator").innerHTML="<h4>Principal Investigator</h4><pre>"+pi[stpi[n]]
                          +"</pre>";

  if (byfilter) 
    document.getElementById("radardiv").filters[0].src="fov/"+stid[n]+".fov.png";
   else 
    document.getElementById("radarimg").src="fov/"+stid[n]+".fov.png";
  
  document.getElementById("radardiv").style.visibility="visible";
  hilight=n;
  return false;
}


function getpdf() {
    url="cgiwrap.cgi/fov%2epdf?command=/www/superdarn/fov/fov.pdf&cli=";
    url=url+hemisphere+"+";
    c=0;
  for (l=0;l<layerid.length;l++) {
    checkid=layerid[l]+"chk";
    el=document.getElementById(checkid);
    if (el.checked) {
      url=url+layerid[l]+",";
      c=c+1;
    }
  }
  if (c==0) url=url+",";
  if (hilight>=0) url=url+"+"+stid[hilight];
  document.location.href=url;
}



function getpng() {
    url="cgiwrap.cgi/fov%2epng?command=/www/superdarn/fov/fov.png&cli=";
    url=url+hemisphere+"+";
    c=0;
  for (l=0;l<layerid.length;l++) {
    checkid=layerid[l]+"chk";
    el=document.getElementById(checkid);
    if (el.checked) {
      url=url+layerid[l]+",";
      c=c+1;
    }
  }
  if (c==0) url=url+",";
  if (hilight>=0) url=url+"+"+stid[hilight];
  document.location.href=url;
}






function setup() {
    /*
  for (l=0;l<layerid.length;l++) {
    checkid=layerid[l]+"chk";
    
    el=document.getElementById(checkid);
    if (layerstate[l]=="visible") el.checked=true;
    else el.checked=false;

    divid=layerid[l]+"div";
    el=document.getElementById(divid);
    el.style.visibility=layerstate[l];

  }
    */
  return 0;
  

}