Serious Problem: Eval'ing conditioned blocks!

Hi there, I (still :-) ) have the code of my php pages stored in a database. A main page parses this code using the "eval_html" function postet at php.net. This used to work fine, but then I tried to employ conditioned blocks, e.g. <? while (foo) { ?> <p>Hello World</p> <? }?> The function I use seperates this code in three parts (1st: <? while (foo) { ?>) and tries to eval every single one. This of course causes an error because neither "while (foo) {" nor "}" is valid statement. Anybody knows a workaround (that doesn't mean putting all HTML output in PHP "echo" commands) ?? Thanks