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 + ")";
    
	//Background Cell
	//document.getElementById(divid).style.backgroundImage = "url(" + document.getElementById(imageid).getAttribute("background") + ")";
    document.getElementById(divid).style.backgroundPosition = "1px 1px";
   // document.getElementById(divid).style.border="0px";
	
	//make image transparent
	changeOpac(0, imageid);
	
	//make new image
	
	document.getElementById(imageid).src = imagefile;
	//document.getElementById(imageid).style.bgcolor = "#FF0000";
    //Background Cell
	//document.getElementById(imageid).setAttribute("background",  imagefile);
	//document.getElementById(imageid).style.backgroundPosition = "0px 0px";
    
	//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)
}



/*********** RunSlideShow ***********/

var slideCache =  new Array();
function RunSlideShow(divid, imageid, imageFiles, displaySecs) {
	
    var imageSeparator = imageFiles.indexOf(";");
    var nextImage = imageFiles.substring(0, imageSeparator);
	
    //changeOpac(0, imageid);
	//alert("antes");
    blendimage(divid, imageid, nextImage, 1000);
	//alert("despues");
    var futureImages = imageFiles.substring(imageSeparator + 1, imageFiles.length) + ';' + nextImage;
    setTimeout("RunSlideShow('" + divid + "','" + imageid + "','" + futureImages + "'," + displaySecs + ")", displaySecs * 1000);

// Cache the next image to improve performance.
    imageSeparator = futureImages.indexOf(";");
    nextImage = futureImages.substring(0, imageSeparator);
	
    if (slideCache[nextImage] == null) {
        slideCache[nextImage] =  new Image;
        slideCache[nextImage].src = nextImage;
	   
	   //Background Cell
	    //slideCache[nextImage].background = nextImage;
		//slideCache[nextImage].bgcolor = "#FF00FF";
    }
}