var monBlock = null;
var monImg = null;
var monIdx = 0;
var monContainer= null;
var monTimeout = 7000;
var monEffect = 1;
var monHref;
var monSrc;
var monCaption;

function montage( href, src, caption, width, height, animate )
{
 if( monBlock )
 {
  return;
 }
  
 monHref  = href;
 monSrc  = src;
 monCaption = caption;
 
 // this is the case for browsers that don't support filters...
 var cycle = Math.floor( Math.random() * href.length );

 // switch off animation if we're not on broadband
 var m_montage = ( typeof(animate) != "undefined" ? animate : hasBroadband() );
 
 // go build all of the nested DIVs out
 monIdx  = cycle;
 
 var nextImage = (monIdx + 1) % src.length;

 if( height > 0 ) { document.writeln( "<div id=\"container\" style=\"width:" + width +"px;height:" + height + "px\">" ); }
 else { document.writeln( "<div id=\"container\" style=\"width:" + width +"px\">" ); }

 for( i = 0; i < src.length; i++ )
 {
  // set up a placeholder
  document.write( "<div id=\"montage" + i + "\" style=\"display:none\">" );
  
  if( i == nextImage )
  {
   // only prefetch the first image we will display
   document.write( montagePicker( i ) );
  }
  
  document.write( "</div>" );
 }

 document.writeln( "</div>" );

 // pull the images out
 monBlock = new Array( src.length );
 monImg  = new Array( src.length );

 for( i = 0; i < src.length; i++ )
 {
  monBlock[i] = document.getElementById( "montage" + i );
  
  if( i == nextImage )
  {
   monImg[i] = document.getElementById( "monimg" + i );
  }
  else
  {
   monImg[i] = null;
  }
 }

 monContainer = document.getElementById("container");
 montageEffects();
}

function montageEffects()
{
 var nextImage = (monIdx + 1) % monImg.length;
 // run the transition 
 if( readIEVer() >= 4.0 && monEffect > 0 )
 {
  try
  {
   if( monEffect == 1 )
   {
    monContainer.style.filter = "blendTrans(duration=0.6)";
    monContainer.filters(0).apply();
     montageSelect( nextImage );
    monContainer.filters(0).play();
   }
   else
   {
    monContainer.style.filter = "blendTrans(duration=1.5) revealTrans(duration=1.0,transition=7)";
    monContainer.filters(0).apply();
    monContainer.filters(1).apply();
     montageSelect( nextImage );
    monContainer.filters(0).play();
    monContainer.filters(1).play();
   }
  }
  catch( e ) { montageSelect( nextImage ); }
 }
 else
 {
  montageSelect( nextImage );
 }

 // asked to be called again a little later
 setTimeout( "montagePrep()", monTimeout - 1500 );
 setTimeout( "montageSwap()", monTimeout );
}

function montageSelect( nextImage )
{
 monBlock[monIdx].style.display = "none";
 monIdx = nextImage;
 monBlock[monIdx].style.display = "block";
}  

function montagePrep()
{
 // prefetch the next image if we don't already have it
 var nextImage = (monIdx + 1) % monImg.length;

 if( !monImg[nextImage] )
 {
  monBlock[nextImage].innerHTML = montagePicker( nextImage );
  monImg[nextImage] = document.getElementById( "monimg" + nextImage );
 }
}

function montageSwap()
{
 if( monImg[monIdx].complete )
 {
  // move the image index along
  montageEffects();
 }
 else
 {
  // check again 3 seconds later
  setTimeout( "montageSwap()", 3000 );
 }
}

function montagePicker( cycle )
{
 var divHtml;

 if( monHref[cycle] != null ) 
 {
  divHtml = "<A href=\"" + monHref[cycle] + "\"><IMG src=\"" + monSrc[cycle] + "\" alt=\"" + monCaption[cycle] + "\" BORDER=\"0\" ID=\"monimg" + cycle + "\"></a>";
 }
 else
 {
  divHtml = "<IMG src=\"" + monSrc[cycle] + "\" ID=\"monimg" + cycle + "\">";
 }
 
 return divHtml;
}
function readIEVer()
{
var agent = navigator.userAgent;
var offset = agent.indexOf( "MSIE" );
if( offset < 0 )
{
return 0;
}
return parseFloat( agent.substring( offset + 5, agent.indexOf( ";", offset ) ) );
}
function readOperaVer()
{
var agent = navigator.userAgent;
var offset = agent.indexOf( "Opera" );
if( offset < 0 )
{
return 0;
}
return parseFloat( agent.substring( offset + 6 ) );
}