Select categories based on page id

Hello guys,
I am
using b/m code for selecting category based on the page id:
Can you please correct me whats wrong in this code as it not selecting the proper category in get_posts function.

if(is_page(’53’))
{$cat=5;}
else
{$cat=1;}
$myposts = get_posts(‘numberposts=10&offset=0&category=$cat’);