var new_slide = "";
var new_len = 0;

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 visible
	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 = 10; i <= 100; i++) {
		setTimeout("changeOpac(" + 100 + ",'" + 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 runSlideShow(divid, imgid, nameStr, counter, max_len) {
	var i = (counter%max_len) + 1 ;
	var i_len = ("" + i).length;
	num = ("00" + i).substring(i_len);
	blendimage(divid, imgid, "images/" + nameStr + num + ".jpg"  ,500);
	if (new_slide.length == 0) {
		setTimeout("runSlideShow(\'" + divid + "\', \'" + imgid + "\', \'" + nameStr + "\', " + eval(counter+1) + ", " + max_len + ")", 6000);
	} else {
		tmp_slide=new_slide;
		tmp_len=new_len;
		new_slide="";
		new_len=0;
		runSlideShow(divid, imgid, tmp_slide, 1, tmp_len);
	}
}

function resetSlide(newSlide, leng, imageid, divid) {
	new_slide = newSlide;
	new_len = leng;
	document.getElementById(imageid).src = "images/" + new_slide + "01.jpg";
//	document.getElementById(divid).style.backgroundImage = "url(" +document.getElementById(imageid).src + ")";
//	return true;
}