var album1 = "First Album name";
var album2 = "Second Album Name";
var album3 = "Third Album Name";
var album4 = "Fourth Album name";
var album5 = "Fifth Album name";

var currentAlbumCtr = 1;
var currentAlbum = album + currentAlbumCtr;

var album = [];
album[1] = "First Album name";
album[2] = "Second Album Name";
album[3] = "Third Album Name";
album[4] = "Fourth Album name";
album[5] = "Fifth Album name";

currentAlbumCtr = 1;
currentAlbum = album[currentAlbumCtr];

var album = {
    "1": "First Album name";
    "2": "Second Album Name";
    "3": "Third Album Name";
    "4": "Fourth Album name";
    "5": "Fifth Album name";
};

var album = [
    "First Album name",
    "Second Album Name",
    "Third Album Name",
    "Fourth Album name",
    "Fifth Album name"
];

currentAlbumCtr = 1;
currentAlbum = album[currentAlbumCtr-1];

if (currentAlbumCtr == 1) {
    currentAlbum = album1;
}

var albums =
           [ "album1",
             "album2",
             "album3" ];

$("#clickme").click(function(){
    var currentAlbum = parseInt($("#album_number").val()) % albums.length;
    alert(albums[currentAlbum]);
})

<button id="clickme">click!</button>
<input id="album_number"></input>

var currentAlbum = eval("album" + currentAlbumCtr);