Thing is, the page (entry.php) that is loaded in the popup window has nothing to do with the page the form is being submitted to (which is....what?)
If the popup is the whole objective, and you're not actually trying to POST a form, then
<form>
<div align="right"><input
type="button"
onClick="MM_openBrWindow('entry.php?var=<? echo urlencode($row['html']); ?>',
'blorb','status=yes,width=400,height=300')"
class="text1"
value="<? echo htmlspecialchars($row['html']); ?>"></div></form>
ought to be sufficient. In entry.php the html thing would be available as $GET['var']. It's $GET, because the variable is being passed to entry.php in the querystring (as part of a GET request). The urlencode() and htmlspecialchars() are defensive programming practice. Consider, for example, that without urlencode(), the URL you're trying to open in the pop would end with ".html".