function chooselogin(formname)
{
  var dropdownIndex = document.getElementById('system').selectedIndex;
  var dropdownValue = document.getElementById('system')[dropdownIndex].value;
  switchDiv(dropdownValue);
}

// function switchDiv()
//  this function takes the id of a div
//  and calls the other functions required
//  to show that div
//
function switchDiv(div_id)
{
  var style_sheet = getStyleObject(div_id);
  if (style_sheet)
  {
    hideAll();
    changeObjectVisibility(div_id,"visible");
  }
  else 
  {
    alert("sorry, this only works in browsers that do Dynamic HTML");
  }
}

// function hideAll()
//  hides a bunch of divs
//
function hideAll()
{
   changeObjectVisibility("login","hidden");
   changeObjectVisibility("login2","hidden");
   changeObjectVisibility("login3","hidden");
   changeObjectVisibility("login4","hidden");

}

// function getStyleObject(string) -> returns style object
//  given a string containing the id of an object
//  the function returns the stylesheet of that object
//  or false if it can't find a stylesheet.  Handles
//  cross-browser compatibility issues.
//
function getStyleObject(objectId) {
  // checkW3C DOM, then MSIE 4, then NN 4.
  //
  if(document.getElementById && document.getElementById(objectId)) {
	return document.getElementById(objectId).style;
   }
   else if (document.all && document.all(objectId)) {  
	return document.all(objectId).style;
   } 
   else if (document.layers && document.layers[objectId]) { 
	return document.layers[objectId];
   } else {
	return false;
   }
}

function changeObjectVisibility(objectId, newVisibility) {
    // first get a reference to the cross-browser style object 
    // and make sure the object exists
    var styleObject = getStyleObject(objectId);
    if(styleObject) {
	styleObject.visibility = newVisibility;
	return true;
    } else {
	// we couldn't find the object, so we can't change its visibility
	return false;
    }
}
// -->

function SWFDelegate(url,width,height,caption) {
   var objLink = document.createElement('a');
   objLink.setAttribute('href',url);
   objLink.setAttribute('rel','lightbox');
   objLink.setAttribute('title',caption);
   if(typeof width != 'undefined') {
      objLink.setAttribute('width',width);
   }
   if(typeof height != 'undefined') {
      objLink.setAttribute('height',height);
   }
   Lightbox.prototype.start(objLink);
}