meta tags

[lucy]

Hi,
I am trying to set separate meta tags for home page, category listing and item view (content video). I lost in php.
In inc/header.php there is section begining with:

Code: Select all

//Meta keywords description
$meta_keywords="";
$meta_description="";

my question is: how to determine which of this 3 pages are displayed? I would like to have code like this:

Code: Select all

if($site=="home page"){
  $meta_keywords="bla, bla, bla";
  $meta_description="bla, bla, bla";
  $sname="bla, bla, bla";
}
if($site=="category listing"){
  $meta_keywords="bla, bla, bla";
  $meta_description="bla, bla, bla";
  $sname="bla, bla, bla";
}
if($site=="item video"){//I have videos only
  $meta_keywords="bla, bla, bla";
  $meta_description="bla, bla, bla";
  $sname="bla, bla, bla";
}