blendIndex = new Array(1,1,1,1,1);
blendInterval = new Array();

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;
	
	if(imagefile == "") {		// wenn letztes bild leer (kein file), dann nur ausblenden
		document.getElementById(divid).style.backgroundImage = "";
		
		for(i = 100; i >= 0; i--) {
			setTimeout("changeOpac(" + i + ",'" + imageid + "')",(timer * speed));
			timer++;
		}	
	}
	else {				
		//set the current image as background
		document.getElementById(divid).style.backgroundImage = "url(" + document.getElementById(imageid).src + ")";	
		
		
		//make image transparent
		changeOpac(0, imageid);
		
		setTimeout("blendOn('"+imageid+"','"+imagefile+"', "+timer+", "+speed+")",50);		
	}
}

function blendOn(imageid, imagefile, timer, speed) {
	//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)
}

function loadNextUrl(nextUrl) {
	window.location.href = nextUrl;
}

function doBlendImages(interval,blendtime,blendId,loop,nextUrl) {
	blendimage('blenddiv'+blendId,'blendimage'+blendId, blendImages[blendId][blendIndex[blendId]],blendtime);
	blendIndex[blendId]++;
	//blendIndex++;
	
	if(blendIndex[blendId] >= blendImages[blendId].length) {	
		//alert(blendIndex[blendId]+"-"+blendImages[blendId].length);
		if(loop == 1) {
			blendIndex[blendId] = 0;			
		}
		else {
			clearInterval(window["interval"+blendId]);
			//theInterval = blendInterval[blendId];
			//clearInterval(theInterval);
			blendIndex[blendId] = 0;			
			if(nextUrl) {				
				setTimeout("loadNextUrl('"+nextUrl+"')",blendtime);
			}
		}
	}
}

function autoblend(interval,blendtime,blendId,loop,nextUrl) {
	preloadImages(imgString[blendId]);
	window["interval"+blendId] = setInterval("doBlendImages("+interval+","+blendtime+","+blendId+","+loop+",'"+nextUrl+"')",interval);	
//	basicInterval = setInterval("doBlendImages("+interval+","+blendtime+","+blendId+","+loop+",'"+nextUrl+"')",interval);	
}