formating textarea content

I tried TinyMce. It works fine if i call the page but have problems when used it in conjuction with iframes. Both text box and the buttons are disabled. I have an index page. When a call is made to the other pages, content of the <div> tag is assigning to the div tag of the index page. Please check the div tags on the index page and the javascript on other pages. Through out my application i use target="cont" for all <a> tags and form submit options.

Main page div tag
__________________
<iframe name="cont" width="1px" height="1px" src="admin/maintenance.cfm" style="visibility:hidden" ></iframe>
<div style="padding-left:0px; padding-top:0px;" id="main_div"></div>


Javascript on other pages
________________________

<script language="JavaScript" type="text/JavaScript">
function load_content () {
if (parent.document.getElementById('main_div')) {
parent.document.getElementById('main_div').innerHTML=document.getElementById('inner_frame').innerHTML;
}

if (!parent.document.getElementById('main_div')) {
window.location=('index.html') ;
}
}
</script>

Any help is appreciated. I am lost with this whole situation