//
// montage.js
//


/*
TRANSITION TYPE

1 Reveal from inside out
2 Scroll in from outer parts
3 Scroll out from center
4 Scroll up from bottom
5 Scroll down from top
6 Scroll left to right
7 Scroll right to left
8 Vertical Blinds left to right
9 Horizontal Blinds top to bottom
10 Combination of 8 and 9
11 Looks a lot like 8
12 Comes in in pixels
13 Scroll in from outer parts
14 Scroll out from center
15 Close from both top and bottom
16 Open from center to top and bottom
17 Diagonal roll from right to left
18 Different angle diagonal roll right to left
19 Number 17: the other way
20 Number 18: the other way
21 Random horizontal lines
22 Random vertical lines
23 Completely Random


*/

var monBlock	= null;
var monImg		= null;
var monIdx		= 0;
var monContainer= null;
var monTimeout	= 7000;

function montage( href, src, caption, width, height, transtype, animate )
{
	// 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() );
	
	if( m_montage == false || src.length <= 1 || !( isIE4 || isW3C ) )
	{
		montagePicker( href, src, caption, cycle );
		return;
	}
*/	
	// go build all of the nested DIVs out
	monIdx		= cycle;

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

	for( i = 0; i < src.length; i++ )
	{
		// set up a placeholder
		document.writeln( "\t<div id=\"montage" + i + "\" style=\"display:none\">" );
		
		montagePicker( href, src, caption, i );

		document.writeln( "\t</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 ).style;
		monImg[i]	= document.getElementById( "monimg" + i );
		
		if( monImg[i] == null )
		{
			montagePicker( href, src, caption, i );
			return;
		}
	//	alert( "foo" );
	}

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

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 montageEffects(transtype)
{
	var nextImage	= (monIdx + 1) % monImg.length;
	
	// run the transition
	if( readIEVer() >= 4.0 )
	{
		monContainer.style.filter = "blendTrans(duration=1.5) revealTrans(duration=1.0,transition=" + transtype + ")";

		monContainer.filters(0).apply();
		monContainer.filters(1).apply();
		
 		montageSelect( nextImage );
		
		monContainer.filters(0).play();
		monContainer.filters(1).play();
	}
	else
	{
		montageSelect( nextImage );
	}

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

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

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

function montagePicker( href, src, caption, cycle )
{
	if( href[cycle] != null ) 
	{
		document.writeln( "\t\t<A HREF=\"" + href[cycle] + "\"><IMG SRC=\"" + src[cycle] + "\" alt=\"" + caption[cycle] + "\" BORDER=\"0\" ID=\"monimg" + cycle + "\"></a>" );
	}
	else
	{
		document.writeln( "\t\t<IMG SRC=\"" + src[cycle] + "\" ID=\"monimg" + cycle + "\">" );
	}
}

/*
function hasBroadband()
{
	if( readIEVer() < 5.0 )
	{
		return false;
	}
	
	try
	{
		document.body.addBehavior ("#default#clientCaps");
	
		return ( typeof(document.body.connectionType) != "undefined" && document.body.connectionType == "lan" );
	}
	catch( e )
	{
		return false;
	}
}
*/

// -------------------------------------------------------------
// end of montage.js
// -------------------------------------------------------------