$(function() {
$('.prev').hover(function() {
var color = this.id;
$('.col-dis').html(color);
$('.col-b').css({"background": "url(../jeans/" + color + "/" + color + "1.jpg)"});
});
});
<div class="prev" id="Metal" ></div>
<div class="prev" id="Monterey" ></div>
<div class="prev" id="Neutral-Grey" ></div>
<div class="prev" id="On-The-Floor" ></div>
<div class="prev" id="Optic-White" ></div>
<div class="col-b"></div>
<br>
<div class="col-dis">Aged Perfect</div>