Manipulating height of a div inside a popup window with ajax content

Hello experts.
I'm using the jqmodal plugin for my popup windows.
I need help to manipulate the height of my div:jqmContent in my load_popup_articel.cfm?articel_id=10 page in the code below.
I have a working solution that is manipulating the height of a div on pageload inside the main page here(https://www.experts-exchange.com/questions/26943020/Manipulate-the-height-of-a-div-using-the-screen-resolution.html) but this is different.

Any help?

<script type="text/javascript" language="javascript" src="js/jquery-1.4.4.min.js"></script>
<script type="text/javascript" language="javascript" src="js/jqmodal/jqmodal.js"></script>
<script type="text/javascript" language="javascript" src="js/jqmodal/jqDnR.js"></script>
<script>
$().ready(function() {
  $('#righttree10').jqm({
    ajax: 'load_popup_articel.cfm?articel_id=10', 
    trigger:'area.rightpart10',
    overlay: 50,
    onShow: function(h) {
       /* callback executed when a trigger click. Show notice */
    h.w.css('opacity',1).slideDown(); 
    },
    onHide: function(h) {
      /* callback executed on window hide. Hide notice, overlay. */
    h.w.slideUp("slow",function() { if(h.o) h.o.remove();})
    }
   });
});
</script>
<style type="text/css">
/* jqModal base Styling courtesy of;
	Brice Burgess <bhb@iceburg.net> */

/* The Window's CSS z-index value is respected (takes priority). If none is supplied,
	the Window's z-index value will be set to 3000 by default (via jqModal.js). */
	
.jqmWindow {
    display: none;
    position: fixed;
    top: 12%;
    left: 47%;
    margin-left: -300px;
    width: 734px;
    color: #333;
    padding: 12px;
	height:600px;
	float:left;
	background:transparent;
}
.jqmOverlay { background-color: #000; }

/* Background iframe styling for IE6. Prevents ActiveX bleed-through (<select> form elements, etc.) */
* iframe.jqm {position:absolute;top:0;left:0;z-index:-1;
	width: expression(this.parentNode.offsetWidth+'px');
	height: expression(this.parentNode.offsetHeight+'px');
}

/* Fixed posistioning emulation for IE6
     Star selector used to hide definition from browsers other than IE6
     For valid CSS, use a conditional include instead */
* html .jqmWindow {
     position: absolute;
     top: expression((document.documentElement.scrollTop || document.body.scrollTop) + Math.round(17 * (document.documentElement.offsetHeight || document.body.clientHeight) / 100) + 'px');
}
</style>

<img src="style/widget/right_tree.gif" width="180" height="318" border="0" usemap="#Map" class="treeright">

<map name="Map">
<area alt="" title="" class="rightpart10" shape="poly" coords="127,269" href="#">
</map>

<div class="jqmWindow" id="righttree10">
Please wait ... <img alt="loading" src="style/images/busy.gif">
</div>



The load_popup_articel.cfm?articel_id=10 page:

<style type="text/css">
.jqmContent {padding-left:4px; padding-right:4px;overflow:scroll;}
</style>

<div class="jqmContent">
    <img src="js/jqmodal/images/close_icon.png" class="jqmClose" style="float:right; padding-top:10px;">
       <div align="center">
         <h2 style="color:#933">Title....
         </h2>
       </div>
       <div align="center">
         <h4>blablabla........
         </h4>
       </div>
    <img src="js/jqmodal/images/close_icon.png" class="jqmClose" style="float:right; padding-top:10px; padding-bottom:10px;">
</div>

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