insertBefore.txt

<script language="javascript">
if(navigator.appName.search(/Microsoft/)>=0)
{
	insert = document.createElement('<div id="delete_<?php echo $unique; ?>">');
}
else
{
	insert = document.createElement('div');
	insert.setAttribute('id', 'delete_<?php echo $unique; ?>');
}

x_bef = document.getElementById('f1');
x_bef.insertBefore(insert, null);

innerX='ssdfsdfsd';

insert.innerHTML = innerX;
</script>

=====================================
[FBML]
insert = document.createElement('div');
insert.setId('dummy_1');	
x_bef = document.getElementById('center');
x_bef.appendChild(insert);
insert.setInnerFBML(page_fbml_1);


====================================
[2010]
insert = document.createElement('div');
insert.setAttribute('id', 'delete_<?php echo $unique; ?>');
x_bef = document.getElementById('f1');
x_bef.parentNode.insertBefore(insert, x_bef);
x_bef.parentNode.insertBefore(insert, x_bef.nextSibling); //insert after
insert.innerHTML = innerX;

http://reference.sitepoint.com/javascript/Node/insertBefore