Updating a new set of coordinates using ExtJS on CSS

[saltoceana]

I tried using the following to remove some of my previous CSS declaration so that I can insert new ones but seems to fail.

Ext.util.CSS.removeStyleSheet(keyname);

The full code

<script type="text/javascript">
    var puthtml = "";

    var selectedbgcolor = "#FF0F00";
    var place = [];

$(document).ready(function() {

  $(".pressButton").button();
  $(".pressButton").click(function() {

    alert(this.name);
    document.getElementById("new_points").style.backgroundImage="url('" + this.name + "')";

        var allextRules = Ext.util.CSS.getRules();

        Object.keys(allextRules).forEach(function(key) {
            var keyname = key;
            if(keyname.indexOf("Points") != -1){
                Ext.util.CSS.removeStyleSheet(keyname);
                console.log(keyname + " Removed");
            }

         });        


        for(var i=0; i<coords.length; i++){
            if(coords[i][0] = this.name){
                place.push(["NewDot", "#Points" + i + " { background: url('" + yellowdot + "') no-repeat; \n position: absolute; \n top: " + coords[i][2] + "px; \n left: " + coords[i][3] + "px; \n width: " + coords[i][4] + "px; \n height: " + coords[i][5] + "px; \n }", "Entry " + coords[i][6]]);
            }
        }

        puthtml = "";
        for(var i=0; i<place.length; i++){
            Ext.util.CSS.createStyleSheet(place[i][1], place[i][0]);
            puthtml = puthtml + "<div id=\"js" + i + "\"><br><br><div id='text' style='text-align:center; background-color:" + selectedbgcolor + "; border-width: 4px; border-style: solid; border-color: #454545'>" + place[i][2] + "</div></div>";
        }

        var DomHelp = Ext.core.DomHelper;
        var DomQy = Ext.DomQuery;

        var wrap = DomQy.selectNode('#new_points');
        DomHelp.insertHtml('beforeEnd', wrap, puthtml);

  });


});

and the CSS as follows:

<style type="text/css">
div#new_points {
    background: url('http://hdfreewallpaper.info/assets/hdfreewallpaper/2011/07/25/wall/7574/1280x800/lake-coleridge-new-zealand-1280-x-800.jpg') no-repeat #d2d2d2;
    margin:0 auto;
    /*border:2px solid #9e9e9e;*/
    border:2px solid #000000;
    width:1280px;
    height:800px;
    position: relative;
    overflow: hidden;
}
</style>

Any Insight?