ho questo codice in pratica mi genera la pagina

codice:
<div id ="container">
  
  <div id="top" >
  
  <iframe frameborder="0" height="100%" width="100%" name="speedbar" src="frame/speedbar.php?<?php SID ?>" scrolling="no" ></iframe>
  
  </div>   <div id="blocks_sx" class="x-layout-inactive-content"><iframe  frameborder="0" height="100%" width="100%" name="tree" src="frame/tree2.php?nolock" ></iframe></div>
  <div id="blocks_dx" class="x-layout-inactive-content"><iframe  frameborder="0" height="100%" width="100%" name="help" src="frame/helpframe/helpframe.php?nolock" ></iframe></div>
  <div id="content" class="x-layout-inactive-content"></div>
  <div id="inner_page" class="x-layout-inactive-content"><iframe  frameborder="0" height="100%" width="100%" name="page" src="frame/page.php?<?php SID ?>" >qui ci va qualcosa</iframe></div>
  <div id="inner_news" class="x-layout-inactive-content"><iframe  frameborder="0" height="100%" width="100%" name="bottom" src="frame/bottom.php?<?php SID ?>" ></iframe></div>
  
</div>
ecco la classe x-layout-inactive-content

codice:
.x-layout-inactive-content{
    position:absolute;
    left:-10000px; 
    top:-10000px; 
	visibility:hidden;
}
ma mentre con Firefox o Safari funziona
con IE7 non mi visualizza praticamente niente...