Default .ess stylesheets

[njohnson]

Is it possible to overwrite a default stylesheet: 

<link type="text/css" rel="stylesheet" href="/shortform/faces/rfRes/skinning.ecss?db=eAHL6rC8BQAEkAIG" />

There is a default interferring with the styling on our website.

Thank you.

[njohnson]

Let me give a better explanation:

This file  <f:loadBundle basename="resources.application" var="msg"/>

is rendered by the browser something like this,  The .ess are in bold and understand they are dyanmically driven...  There are also a number of images... I need to have more control over these... as they also include background images I cannot find..  I'm wondering if someone can help...

I am a front-end developer...  

<link type="text/css" rel="stylesheet" href="/xx/faces/rfRes/skinning.ecss?db=eAHL6rC8BQAEkAIG" /> <script type="text/javascript" src="/xx/faces/javax.faces.resource/jsf.js?ln=javax.faces"></script><link type="text/css" rel="stylesheet" href="staticfiles/scassets/css/msg.ecss?db=eAHL6rC8BQAEkAIG&amp;ln=org.richfaces" /><script type="text/javascript" src="/xx/faces/javax.faces.resource/jquery.js"></script><script type="text/javascript" src="/xx/faces/javax.faces.resource/richfaces.js"></script><script type="text/javascript" src="/xx/faces/javax.faces.resource/richfaces-event.js"></script><script type="text/javascript" src="/xx/faces/javax.faces.resource/richfaces-base-component.js"></script><script type="text/javascript" src="/xx/faces/javax.faces.resource/message.js?ln=org.richfaces"></script><script type="text/javascript" src="/xx/faces/javax.faces.resource/jquery.position.js"></script><script type="text/javascript" src="/xx/faces/javax.faces.resource/json-dom.js?ln=org.richfaces"></script><script type="text/javascript" src="/xx/faces/javax.faces.resource/jquery.effects.core.js?ln=org.richfaces"></script><script type="text/javascript" src="/xx/faces/javax.faces.resource/jquery.effects.highlight.js?ln=org.richfaces"></script><script type="text/javascript" src="/xx/faces/javax.faces.resource/JQuerySpinBtn.js?ln=org.richfaces"></script><script type="text/javascript" src="/xx/faces/javax.faces.resource/calendar-utils.js?ln=org.richfaces"></script><script type="text/javascript" src="/xx/faces/javax.faces.resource/calendar.js?ln=org.richfaces"></script>

<link type="text/css" rel="stylesheet" href="/xx/faces/rfRes/calendar.ecss?db=eAHL6rC8BQAEkAIG&amp;ln=org.richfaces" />