I have tried this with no luck..
Code:
register_srvcmd("client_print", "HideAds");
public HideAds()
{
new szArg[192];
read_args( szArg, charsmax( szArg ) );
remove_quotes( szArg );
if (equal( szArg, "TXT_TO_HIDE" ) )
return PLUGIN_HANDLED;
return PLUGIN_CONTINUE;
}