Variable not translating into selector - JQuery

To make my Jquery more flexible I've pulled the selector out and I'm trying to access it through a variable, but both variables for both selectors don't appear to be working. I'm sure it'll be something simple that I'm missing and can't see, but I just can't find it.

Jquery

var accordion = "#accordion"; var accordionextra = accordion + " .panel-heading img'"; $(accordionextra).hide(); $(accordion).find('.panel-collapse').each(function() { //Do Something }) 

HTML:

<div class="panel-group" id="accordion" role="tablist" aria-multiselectable="true"> <div class="panel panel-default"> <div class="panel-heading" role="tab" id="headingOne"> <h4 class="panel-title"> <a role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseOne" aria-expanded="true" aria-controls="collapseOne"> Collapsible Group Item #1 <img src="image/check.png" class="pull-right check" /> </a> </h4> </div> <div id="collapseOne" class="panel-collapse collapse in" role="tabpanel" aria-labelledby="headingOne"> <div class="panel-body"> <form> <div class="form-group"> <label for="exampleInputEmail1">Email address</label> <input type="email" class="form-control class1" id="exampleInputEmail1" placeholder="Email"> </div> <div class="form-group"> <label for="exampleInputPassword1">Password</label> <input type="password" class="form-control class1" id="exampleInputPassword1" placeholder="Password"> </div> <button type="submit" class="btn btn-default">Submit</button> </form> </div> </div> </div> <div class="panel panel-default"> <div class="panel-heading" role="tab" id="headingTwo"> <h4 class="panel-title"> <a class="collapsed" role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo"> Collapsible Group Item #2 <img src="image/check.png" class="pull-right check" /> </a> </h4> </div> <div id="collapseTwo" class="panel-collapse collapse" role="tabpanel" aria-labelledby="headingTwo"> <div class="panel-body"> <form> <div class="form-group"> <label for="exampleInputEmail1">Email address</label> <input type="email" class="form-control class2" id="exampleInputEmail1" placeholder="Email"> </div> <div class="form-group"> <label for="exampleInputPassword1">Password</label> <input type="password" class="form-control class2" id="exampleInputPassword1" placeholder="Password"> </div> <div class="checkbox"> <label> <input type="checkbox" class="class2"> Check me out </label> </div> <button type="submit" class="btn btn-default">Submit</button> </form> </div> </div> </div> <div class="panel panel-default"> <div class="panel-heading" role="tab" id="headingThree"> <h4 class="panel-title"> <a class="collapsed" role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseThree" aria-expanded="false" aria-controls="collapseThree"> Collapsible Group Item #3 <img src="image/check.png" class="pull-right check" /> </a> </h4> </div> <div id="collapseThree" class="panel-collapse collapse" role="tabpanel" aria-labelledby="headingThree"> <div class="panel-body"> <form> <div class="form-group"> <label for="exampleInputEmail1">Email address</label> <input type="email" class="form-control" id="exampleInputEmail1" placeholder="Email"> </div> <div class="form-group"> <label for="exampleInputPassword1">Password</label> <input type="password" class="form-control" id="exampleInputPassword1" placeholder="Password"> </div> <div class="checkbox"> <label> <input type="checkbox"> Check me out </label> </div> <button type="submit" class="btn btn-default">Submit</button> </form> </div> </div> </div> </div>