var mnCycle=new Array();
var mnDivId=new Array();
var mnImageId=new Array();
var mnLinkId=new Array();
var mnSrc=new Array();
var mnUrl=new Array();
var mnTime=new Array();


function beginSlide( divid, imageid,linkid, src, url,time,iArray){
    mnCycle[iArray]	= Math.floor( Math.random() * src.length );
	mnDivId[iArray]=divid;
	mnImageId[iArray]=imageid;
	mnSrc[iArray]=src;
	mnUrl[iArray]=url;
	mnLinkId[iArray]=linkid;
	mnTime[iArray]=time;
	animateSlide(iArray);
	//stepSlide(iArray);
}
function stepSlide(iArray){
    blendimage(mnDivId[iArray],mnImageId[iArray],mnSrc[iArray][mnCycle[iArray]],1500);
	mnCycle[iArray]	= (mnCycle[iArray] + 1) % mnSrc[iArray].length;
	document.getElementById(mnLinkId[iArray]).href = mnUrl[iArray][mnCycle[iArray]];
}
function animateSlide(iArray){
	stepSlide(iArray);
	setTimeout( "animateSlide("+iArray+")", mnTime[iArray]);
}

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.KhtmlOpacity = (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)
}