[Typo3] changing the 'memory_limit' to 16 with ini_set()

[Pawe³ Stanis³awczuk]

Hello,

I have problems with running typo3 on my host. I can't change it manualy, so 
the company where my hosting is told me to use ini_set() to change the 
'memory_limit'
How to do that? i've been to www.php.net saw the function, but i don't know 
where to use it!
could somebody help me with this?

greetz,
Pawe³ Stanis³awczuk