Edit in JSFiddle

$(document).ready(function() {
    arrayOfImg = ["http://24.media.tumblr.com/tumblr_mc9tpsX8Up1rfygheo1_250.jpg", "http://25.media.tumblr.com/tumblr_mczqxjE6yL1rfygheo1_250.jpg", "http://24.media.tumblr.com/tumblr_mczqzbiHSg1rfygheo1_250.jpg"];
    // place all links here
    arrayOfHref = ["http://inkperweek.tumblr.com/post/34071658607/traxex-the-drow-ranger-by-aj-banda", "http://inkperweek.tumblr.com/post/35025838536/week-9-vampire-vampira-by-aj-banda", "http://inkperweek.tumblr.com/post/35025918118/week-10-cemetery-finish-line-by-aj-banda"];

    var numberRand = Math.floor(Math.random() * arrayOfImg.length);

    $("#rotatingHref").attr("href", arrayOfHref[numberRand]);
    $("#rotatingImg").attr("src", arrayOfImg[numberRand]);
    console.log(numberRand);
    console.log($("#rotatingImg").attr("src"));


});

<div id="pagiImg">
    <a id="rotatingHref" href="http://inkperweek.tumblr.com/post/34071658607/traxex-the-drow-ranger-by-aj-banda" target="_blank">
        <img id="rotatingImg" src="http://24.media.tumblr.com/tumblr_mc9tpsX8Up1rfygheo1_250.jpg" />
    </a>
</div>

#pagi{
    text-decoration:none;
    font-weight:bold;
    background-color:steelblue;
    width:200px;
    color:#ffffff;
    text-align:center;
}
#pagi a{color:#ffffff;text-decoration:none;font-weight:bold;}
#pagiImg{border:1px solid steelblue;width:198px;height:400px;}
#pagiImg img{width:198px;height:400px;}