inserting multiple lines with awk

awk '/<login-module code="com.nlayers.seneca.security.LdapLogin" flag="sufficient">/{p++} /<login-module code="com.nlayers.seneca.security.LdapLogin" flag="sufficient">/ && p==1 {$0="Mulitple lines here\n"$0}1' login-config.xml

In the above awk code inside shell script, i am having problems when i try to insert mulitple lines (shown in bold)
Please can some one help me to know how to insert muliple lines using awk

Thanks.

{$0="line1\nline2\lineN\n"$0}