No onClick, solo cambio automático de imagen y título cada segundo. Aquí está el código que tengo hasta ahora: HTML:

 <div class="col-md-6"> <h2>Fishing Slide Show</h2> <h4 id="caption">Casting on the Upper Kings</h4> <img id="slide" src="images/casting1.jpg" alt="" height="200px"> <div id="slides"> <img src="images/casting1.jpg" alt="Casting on the Upper Kings" height="200px"> <img src="images/casting2.jpg" alt="Casting on the Lower Kings" height="200px"> <img src="images/catchrelease.jpg" alt="Catch and Release on the Big Horn" height="200px"> <img src="images/fish.jpg" alt="Catching on the South Fork" height="200px"> <img src="images/lures.jpg" alt="The Lures for Catching" height="200px"> </div> </div>

Y este es mi Javascript:

 var img_array = ["images/casting1.jpg", "images/casting2.jpg" ,"images/catchrelease.jpg", "images/fish.jpg" ,"images/lures.jpg"]; var alt_array = ["Casting on the Upper Kings", "Casting on the Lower Kings", "Catch and Release on the Big Horn", "Catching on the South Fork", "The Lures for Catching"]; var currImg = 0; var currAlt = 0; function slideShow();{ img.src = img_array[index++, img_array.length]; img.alt = alt_array[index++, alt_array.length]; //document.getElementById("slides").src = img_array[currImg]; //document.getElementById("slides").alt = alt_array[currAlt]; } let stop = setInterval(slideShow, 1000);