I have the below assignment. I attempted to write the javascript code but it's not working. Could someone help me with what was done wrong??

/* Create Variable */

var aamHead = document.querySelector(".aam h3");

var aamParagraph = document.querySelector(".aam p");

var cablecarHead = document.querySelector(".cablecar h3");

var cablecarParagraph = document.querySelector(".cablecar p");

var cityhallHead = document.querySelector(".cityhall h3");

var cityhallParagraph = document.querySelector(".cityhall p");

var ccplazaHead = document.querySelector(".ccplaza h3");

var ccplazaParagraph = document.querySelector(".ccplaza p");

var unplazaHead = document.querySelector(".unplaza h3");

var unplazaParagraph = document.querySelector(".unplaza p");

var figureImage = document.querySelector("figure img");

var figureCaption = document.querySelector("figcaption");

/*Asian Art Museum*/

function showaam() {

aamParagraph.ClassName = "aamParagraph show";

cablecarParagraph.ClassName = "";

cityhallParagraph.ClassName = "";

ccplazaParagraph.ClassName = "";

unplazaParagraph.ClassName = "";

figureImage.src = "images/aam.jpg";

figureImage.alt = "asian art museum image";

figureCaption.textContent = "Asian Art Museum";

}

/*Cable Car*/

function showCablecar(){

aamParagraph.ClassName = "";

cablecarParagraph.ClassName = "show";

cityhallParagraph.ClassName = "";

ccplazaParagraph.ClassName = "";

unplazaParagraph.ClassName = "";

figureImage.src = "images/cablecar.jpg";

figureImage.alt = "cablecar";

figureCaption.textContent = "Cable Car Turnaround";

}

/*Show city hall*/

function showCityhall(){

aamParagraph.ClassName = "";

cablecarParagraph.ClassName = "";

cityhallParagraph.ClassName = "show";

ccplazaParagraph.ClassName = "";

unplazaParagraph.ClassName = "";

figureImage.src = "images/cityhall.jpg";

figureImage.alt = "City Hall";

figureCaption.textContent = "City Hall";

}

/*CC Plaza*/

function showCcplaza(){

aamParagraph.ClassName = "";

cablecarParagraph.ClassName = "";

cityhallParagraph.ClassName = "";

ccplazaParagraph.ClassName = "show";

unplazaParagraph.ClassName = "";

figureImage.src = "images/ccplaza.jpg";

figureImage.alt = "Civic Center Plaza";

figureCaption.textContent = "Civic Center Plaza";

}

/*UN Plaza*/

function showUnplaza(){

aamParagraph.ClassName = "";

cablecarParagraph.ClassName = "";

cityhallParagraph.ClassName = "";

ccplazaParagraph.ClassName = "";

unplazaParagraph.ClassName = "show";

figureImage.src = "images/unplaza.jpg";

figureImage.alt = "United Nations Plaza";

figureCaption.textContent = "United Nations Plaza";

}

/*event listener*/

aamHead.addEventListener("change", showaam, false);

cablecarHead.addEventListener("change",showCablecar,false);

cityhallHead.addEventListener("change",showCityhall,false);

ccplazaHead.addEventListener("change",showCcplaza,false);

unplazaHead.addEventListener("change",showUnplaza,false);

Independent Challenge 3 Diego Merckx, the manager of the Hotel Natoma, would like to make the list of local attractions on the hotel's website interactive. When a user clicks the name of an attraction, he'd like the web page to display an image of the attraction as well as a description. You create JavaScript code to add this functionality a. In your editor, open HTM M-13.html from the IC3 folder where you store your Data Files for this unit, save it as nearby.html, then repeat to save HTM M-14.css as styles.css and HIM M-15.js as script.js. In the comment section at the top of each file, enter your name and today's date where indicated, then save the files b. Open nearby.html in a browser, dick each of the S headings on the right side of the page, and verify that nothing happens. Independent Challenge 3 Diego Merckx, the manager of the Hotel Natoma, would like to make the list of local attractions on the hotel's website interactive. When a user clicks the name of an attraction, he'd like the web page to display an image of the attraction as well as a description. You create JavaScript code to add this functionality a. In your editor, open HTM M-13.html from the IC3 folder where you store your Data Files for this unit, save it as nearby.html, then repeat to save HTM M-14.css as styles.css and HIM M-15.js as script.js. In the comment section at the top of each file, enter your name and today's date where indicated, then save the files b. Open nearby.html in a browser, dick each of the S headings on the right side of the page, and verify that nothing happens