function getbyid(id) {
  itm = null;
  if (document.getElementById) {
    itm = document.getElementById(id);
  }
  else if (document.all) {
    itm = document.all[id];
  }
  else if (document.layers)   {
    itm = document.layers[id];
  }
  return itm;
}
function hide_div(itm) {
  if ( ! itm ) return;
  itm.style.display = "none";
}
function show_div(itm) {
  if ( ! itm ) return;
  itm.style.display = "";
}
function resizeTextarea(itm,direction) 
{
  var txtarea = document.getElementById(itm);
  if (direction == 'down') 
  {
   txtarea.rows = txtarea.rows + 3;
  } 
  else 
  {
   txtarea.rows = txtarea.rows - 3;
  }
}

function openCentered(theURL,winName,winWidth,winHeight,features) {
 var w = (screen.width - winWidth)/2;
 var h = (screen.height - winHeight)/2 - 30;
 features = features+',width='+winWidth+',height='+winHeight+',top='+h+',left='+w;
 window.open(theURL,winName,features);
}