var TimeToFade = 300.0;
var images = 1;
var currentImage = 0;
var doFadeIn = false;

var timeOut1;
var timeOut2;

var isPause = false;

//var link0 = "perfil_contratante.php?type=1&id=72"; OPVIA
var link0 = "cafeteria.php";
var link1 = "/doc/file/tripticoCEFITES.pdf";
var link2 = "nuevos_proyectos.php?id=32";
var link3 = "#";
//var link0 = "perfil_contratante.php?type=1&id=69";
//var link2 = "nuevos_proyectos.php?id=32";
//var link1 = "perfil_contratante.php?type=1&id=72";

function autoCarrousel(eid){
	var link = document.getElementById("link_"+eid);
	link.setAttribute("href", link0);
	//timeOut1 = setTimeout("nextCarrouselImg('" + eid + "')", 8000);
	//timeOut2 = setTimeout("autoCarrousel('" + eid + "')", 8000);
}

function pause(eid){
	btn_pause_carrousel = document.getElementById("btn_pause_carrousel");
	if (isPause) {
		btn_pause_carrousel.src = "img/btn_cover_pause.jpg";
		autoCarrousel(eid);
	} else {
		btn_pause_carrousel.src = "img/btn_cover_play.jpg";
		clearTimeout(timeOut1);
		clearTimeout(timeOut2);		
	}
	isPause = !isPause;
}

function next(eid){
	clearTimeout(timeOut1);
	clearTimeout(timeOut2);
	nextCarrouselImg(eid);
	autoCarrousel(eid);
}

function previous(eid){
	clearTimeout(timeOut1);
	clearTimeout(timeOut2);
	previousCarrouselImg(eid);
	autoCarrousel(eid);
}

function nextCarrouselImg(eid){
	if (currentImage+1<images) {
		currentImage++;
	} else {
		currentImage = 0;
	}
	doFadeIn = true;
	dofade(eid);
}

function previousCarrouselImg(eid){
	if (currentImage-1>=0) {
		currentImage--;
	} else {
		currentImage = images-1;
	}
	doFadeIn = true;
	dofade(eid);
}

function dofade(eid)
{
  var element = document.getElementById(eid);
  if(element == null)
    return;
   
  if(element.FadeState == null)
  {
    if(element.style.opacity == null
        || element.style.opacity == ''
        || element.style.opacity == '1')
    {
      element.FadeState = 2;
    }
    else
    {
      element.FadeState = -2;
    }
  }
   
  if(element.FadeState == 1 || element.FadeState == -1)
  {
    element.FadeState = element.FadeState == 1 ? -1 : 1;
    element.FadeTimeLeft = TimeToFade - element.FadeTimeLeft;
  }
  else
  {
    element.FadeState = element.FadeState == 2 ? -1 : 1;
    element.FadeTimeLeft = TimeToFade;
    setTimeout("animateFade(" + new Date().getTime()
        + ",'" + eid + "')", 33);
  } 
}

function animateFade(lastTick, eid)
{ 
  var curTick = new Date().getTime();
  var elapsedTicks = curTick - lastTick;
 
  var element = document.getElementById(eid);
  var link = document.getElementById("link_"+eid);
 
  if(element.FadeTimeLeft <= elapsedTicks)
  {
    element.style.opacity = element.FadeState == 1 ? '1' : '0';
    element.style.filter = 'alpha(opacity = '
        + (element.FadeState == 1 ? '100' : '0') + ')';
    element.FadeState = element.FadeState == 1 ? 2 : -2;
	if (doFadeIn) {
		var l = "";
		if (currentImage==0) {
			l = link0;
		} else if (currentImage==1) {
			l = link1;
		} else if (currentImage==2) {
			l = link2;
		} else if (currentImage==3) {
			l = link3;
		}
		link.setAttribute("href", l);
		element.src = "img/carrousel" + currentImage + ".jpg";
		dofade(eid);
		doFadeIn = false;
	}
    return;
  }
 
  element.FadeTimeLeft -= elapsedTicks;
  var newOpVal = element.FadeTimeLeft/TimeToFade;
  if(element.FadeState == 1)
    newOpVal = 1 - newOpVal;

  element.style.opacity = newOpVal;
  element.style.filter =
      'alpha(opacity = ' + (newOpVal*100) + ')';
 
  setTimeout("animateFade(" + curTick
      + ",'" + eid + "')", 33);
}