javascript - Loop elements opacity -


i'm making script fades 3 pictures out in order, pictures' opacity aren't changing. if statements reached pictures not change. first picture changes 1 opacity on page load, don't see why wouldn't work in function.

window.onload = function() {      document.getelementbyid("img1").style.opacity = 1;     setinterval(swappictures, 2000); };  var swappictures = function(){    if(typeof swappictures.img1v === 'undefined'){          swappictures.img1v = true; } if(typeof swappictures.img2v === 'undefined'){          swappictures.img2v = false; } if(typeof swappictures.img3v === 'undefined'){          swappictures.img3v = false; }  if(swappictures.img1v  && !swappictures.img2v && !swappictures.img3v){          swappictures.img1v = !swappictures.img1v;          swappictures.img2v = !swappictures.img2v;          document.getelementbyid("img1").style.opacity = .4;          document.getelementbyid("imgtwo").style.opactiy = 1; }else if(!swappictures.img1v && swappictures.img2v && !swappictures.img3v){          swappictures.img2v = !swappictures.img2v;          swappictures.img3v = !swappictures.img3v;          document.getelementbyid("imgtwo").style.opacity = .4;          document.getelementbyid("imgthree").style.opactiy = 1;  }else if(!swappictures.img1v && !swappictures.img2v && swappictures.img3v){          swappictures.img3v = !swappictures.img3v;          swappictures.img1v = !swappictures.img1v;          document.getelementbyid("imgthree").style.opacity = .4;          document.getelementbyid("img1").style.opactiy = 1;  }  };

jsbin demo

this need:

var $mppics = document.getelementsbyclassname("mppics"); var n = $mppics.length; var c = 0;  function fadeimg(){   for(var i=0; i<n; i++) $mppics[i].style.opacity = 0.4;   $mppics[c++%n].style.opacity = 1; } fadeimg();   setinterval(fadeimg, 2000);

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