// Run slideshow
var imageIndex = 0;
var images;
var divid;
var imageid1;
var imageid2;
var imageduration;
var fadeduration;
var pageid = "117";

// Run the slideshow with given images, divid, imageid2, image duratione and fade duration
// div with divid must contain image with imageid2 and must be of equal size
function playSlideShow(pDivid, pimageid1, pimageid2, pImageduration, pFadeduration) {   
    if (!CmsEditorActive) {
        initSlideShow(pDivid, pimageid1, pimageid2, pImageduration, pFadeduration);
        
        // run slideshow only if there is more then one picture
        if (Pic.length > 1){
            runSlideShow();
        } else {
            document.getElementById(imageid2).src = Pic[0];
        }
    }
}

function initSlideShow (pDivid, pimageid1, pimageid2, pImageduration, pFadeduration){
    // If there are no images then show blank.gif
    if(Pic.length == 0) {
        Pic[0] = "/sites/" + pageid + "/images/blank.gif";
    }
    images = Pic;
    divid = pDivid;
    imageid1 = pimageid1;
    imageid2 = pimageid2;
    imageduration = pImageduration;
    fadeduration = pFadeduration;
}

function runSlideShow (){
    blendimage(divid, imageid1, imageid2, images[imageIndex], fadeduration);
    imageIndex = (imageIndex + 1) % images.length;
    setTimeout('runSlideShow()', imageduration);
}

//******************************************************************
// Source from http://brainerror.net/scripts/javascript/blendtrans/
//******************************************************************

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, imageid1, imageid2, imagefile, millisec) {
	var speed = Math.round(millisec / 20);
	var timer = 0;
	
	//set the current image as background
	document.getElementById(divid).style.backgroundImage = "url(" + document.getElementById(imageid2).src + ")";
	
	//make image transparent
	changeOpac(0, imageid2);
	changeOpac(0, imageid1);
	
	//make new image
	document.getElementById(imageid2).src = imagefile;

	//fade in image
	for(i = 0; i <= 100; i = i + 5) {
		setTimeout("fadeimages(" + i + ",'" + imageid1 + "','" + imageid2 + "')",(timer * speed));
		timer++;
	}
}

function fadeimages (opacity, id1, id2) {
    changeOpac(opacity, id1);
    changeOpac(opacity, id2);
}

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)
}

//**********************************************************
// End Source from http://brainerror.net/scripts/javascript/blendtrans/
//**********************************************************