var count=0;
var nCount = 0;
var fade_started=0;

function RandomNumber(n)
{ // This should return a random number 
  return Math.floor(Math.random() * n);
}

function fadeTrans(id1, id2, t1)
{
  if(fade_started==0)
  {
    fade_started=1;
    opacity(id1,100,0,t1);
    setTimeout("fadeTrans('"+id1+"', '"+id2+"', "+t1+")",t1);
  }
  else
  {
    document.getElementById(id1).src = document.getElementById(id2).src;
    opacity(id1, 0, 100, t1);
    setTimeout("fadeTransComplete()",t1);
  }
}
function fadeTransComplete()
{
  fade_started=0;
}

//This script comes from http://www.brainerror.net/scripts_js_blendtrans.php
function opacity(id,opacStart,opacEnd,millisec)
	{
	//speed for each frame
	var speed = Math.round(millisec / 100);
	var timer = 0;

	//determine the direction for the blending, if start and end are the same nothing happens
	if(opacStart > opacEnd)
		{
		for(i = opacStart; i >= opacEnd; i--)
			{
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
			timer++;
			}
		}
	else if(opacStart < opacEnd)
		{
		for(i = opacStart; i < opacEnd; i++)
			{
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
			timer++;
			}
		}
	}
//change the opacity for different browsers
function changeOpac(opacity,id)
	{
	var object = document.getElementById(id).style; 
	object.opacity = (opacity / 100);
	object.MozOpacity = (opacity / 100);
	object.filter = "alpha(opacity=" + opacity + ")";
	}

function shiftOpacity(id,millisec)
	{
	//if an element is invisible, make it visible, else make it ivisible
	if(document.getElementById(id).style.opacity == 0)
		{
		opacity(id, 0, 100, millisec);
		}
	else
		{
		opacity(id, 100, 0, millisec);
		}
	}

function blendimage(divid,imageid,imagefile,millisec)
	{
	var speed = Math.round(millisec / 100);
	var timer = 0;
	
	//set the current image as background
	document.getElementById(divid).style.backgroundImage = "url(" + document.getElementById(imageid).src + ")";
	
	//make image transparent
	changeOpac(0,imageid);
	
	//make new image
	document.getElementById(imageid).src = imagefile;

	//fade in image
	for(i = 0; i <= 100; i++)
		{
		setTimeout("changeOpac(" + i + ",'" + imageid + "')",(timer * speed));
		timer++;
		}
	}

function currentOpac(id,opacEnd,millisec)
	{
	//standard opacity is 100
	var currentOpac = 100;
	
	//if the element has an opacity set, get it
	if(document.getElementById(id).style.opacity < 100)
		{
		currentOpac = document.getElementById(id).style.opacity * 100;
		}

	//call for the function that changes the opacity
	opacity(id,currentOpac,opacEnd,millisec)
	}