<!-- This file originally found at http://www.erowid.org/general/splash/splash_fade.js -->
//var WhichFade = 0;
var FadeCount = 0;
var PositionList = new Array("x1y1","x2y1","x3y1","x1y2","x1y3", "x4y2","x5y2", "x3y6","x2y4","x1y5","x4y4","x6y4","x5y5","x6y5");

function ClickFade()
{
	    FadeCount++;
		// only do it every 4 times... ??
		//if (! FadeCount % 4) { return; }
		var NumPositions = PositionList.length;
		var WhichFade = Math.floor(Math.random() * NumPositions); 
		var block = PositionList[WhichFade];
		var BlockElement = document.getElementById('block_' + block);
		if (! BlockElement ) { alert("huh, no block found for : " + block);}
		var ReplaceWithImageFileName = 'images/splash/blocks/cacao1_blk.jpg';		
		swapfade(BlockElement, ReplaceWithImageFileName, '3', 'huh?');
		
}
function FadeBlock(blockid)
{
  var ImgBlock = document.getElementById('block_' + blockid);

 for (var i = 0 ; i < 100; i++)
 {
   var Opacity = (100 - i) / 100;
   ImgBlock.style.MozOpacity = Opacity;
 }

}
function DoFade()
{
  
}


// ISF1.11 :: Image swap-fade 
// *****************************************************
// DOM scripting by brothercake -- http://www.brothercake.com/
//******************************************************
//global object
var isf = { 'clock' : null, 'fade' : true, 'count' : 1 }
/*******************************************************

*****************************************************************************
*****************************************************************************/


isf.imgs = [
	];

//cache the images
isf.imgsLen = isf.imgs.length;
isf.cache = [];
for(var i=0; i<isf.imgsLen; i++)
{
	isf.cache[i] = new Image;
	isf.cache[i].src = isf.imgs[i];
}


//swapfade setup function
function swapfade()
{
	//if the timer is not already going
	if(isf.clock == null)
	{
		//copy the image object 
		isf.obj = arguments[0];
		
		//copy the image src argument 
		isf.src = arguments[1];
		
		//store the supported form of opacity
		if(typeof isf.obj.style.opacity != 'undefined')
		{
			isf.type = 'w3c';
		}
		else if(typeof isf.obj.style.MozOpacity != 'undefined')
		{
			isf.type = 'moz';
		}
		else if(typeof isf.obj.style.KhtmlOpacity != 'undefined')
		{
			isf.type = 'khtml';
		}
		else if(typeof isf.obj.filters == 'object')
		{
			//weed out win/ie5.0 by testing the length of the filters collection (where filters is an object with no data)
			//then weed out mac/ie5 by testing first the existence of the alpha object (to prevent errors in win/ie5.0)
			//then the returned value type, which should be a number, but in mac/ie5 is an empty string
			isf.type = (isf.obj.filters.length > 0 && typeof isf.obj.filters.alpha == 'object' && typeof isf.obj.filters.alpha.opacity == 'number') ? 'ie' : 'none';
		}
		else
		{
			isf.type = 'none';
		}
		
//salert('type: ' + isf.type );
		//change the image alt text if defined
		if(typeof arguments[3] != 'undefined' && arguments[3] != '')
		{
			isf.obj.alt = arguments[3];
		}
		
		//if any kind of opacity is supported
		if(isf.type != 'none')
		{
			//copy and convert fade duration argument 
			//the duration specifies the whole transition
			//but the swapfade is two distinct transitions
			isf.length = parseInt(arguments[2], 10) * 1000;
			
			//create fade resolution argument as 20 steps per transition
			//again, split for the two distrinct transitions
			isf.resolution = 500; //parseInt(arguments[2], 10) * 10;
			
			//alert("length: " + isf.length + " total? " +  isf.length/isf.resolution);
			//start the timer
			isf.clock = setInterval('isf.swapfade()', isf.length/isf.resolution);
			
		}
		
		//otherwise if opacity is not supported
		else
		{
			//just do the image swap
			isf.obj.src = isf.src;
		}
		
	}

};
var Counter = 0;

//swapfade timer function
isf.swapfade = function()
{
	//increase or reduce the counter on an exponential scale
//	isf.count = (isf.fade) ? isf.count * 0.99 : (isf.count * (1/0.99)); 

    var SlowerNearBottom = (isf.count < 0.4) ? .3 : 1; 
//	var SlowerNearBottom = 1;
    var IncrementSize = (1 / isf.resolution) * SlowerNearBottom;
	//increase or reduce the counter on an exponential scale
	isf.count = (isf.fade) ? isf.count - IncrementSize : isf.count + IncrementSize; 
//	if (isf.count > 0.99 && Counter == 0) isf.count = 1;	

Counter++;
//if (Counter < 5) { alert("count ? " + isf.count);}
	
	//if the counter has reached the bottom
	if(isf.count < (1 / isf.resolution))
	{
		//clear the timer
		clearInterval(isf.clock);
		isf.clock = null;

		//do the image swap
		isf.obj.src = isf.src;
		
		//reverse the fade direction flag
		isf.fade = false;
		
		//restart the timer
		isf.clock = setInterval('isf.swapfade()', isf.length/isf.resolution);

	}
	
	//if the counter has reached the top
	if(isf.count > (1 - (1 / isf.resolution)))
	{
		//clear the timer
		clearInterval(isf.clock);
		isf.clock = null;

		//reset the fade direction flag
		isf.fade = true;
		
		//reset the counter
		isf.count = 1;
	}
//alert("isf.count : " + isf.count);
	//set new opacity value on element
	//using whatever method is supported
	switch(isf.type)
	{
		case 'ie' :
			isf.obj.filters.alpha.opacity = isf.count * 100;
			break;
			
		case 'khtml' :
			isf.obj.style.KhtmlOpacity = isf.count;
			break;
			
		case 'moz' : 
			//restrict max opacity to prevent a visual popping effect in firefox
			isf.obj.style.MozOpacity = (isf.count == 1 ? 0.9999999 : isf.count);
			break;
			
		default : 
			//restrict max opacity to prevent a visual popping effect in firefox
			isf.obj.style.opacity = (isf.count == 1 ? 0.9999999 : isf.count);
	}
};