Code help on a multi select list

[Stuart Felenstein <stuart4m@xxxxxxxxx>]

I want to do a server side trap if a user selects more
from a mult select list then allowed.  Just unsure and
didn't find any examples.  Seems people rely more on
javascript these days.  

So here is how I grab the array:

if ( is_array( $_REQUEST['LurkerIndustry'] ) ) {
$_SESSION['l_industry'] = array_unique(
array_merge( $_SESSION['l_industry'],
 $_REQUEST['LurkerIndustry'] )
);
}

here is my somewhat hazy notion: 

if 
( is_array( $_REQUEST['LurkerIndustry'] ) ) {
$_SESSION['l_industry'] = array_unique(
if $l_industry > 5 
   ( Here I'm guess I need to redirect back to page   
         with and error message)

else
array_merge( $_SESSION['l_industry'],
 $_REQUEST['LurkerIndustry'] )
);
}

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