For example add into /etc/apt/sources.lists following lines: 

# some coment
deb http://www.cecak.cz/debian/lenny ./
[ICO]NameLast modifiedSizeDescription
[DIR]Parent Directory  -
[TXT]HEADER.html09-Dec-2010 20:37 151
[ ]Override09-Dec-2010 20:37 0
[ ]Packages30-Mar-2011 23:07 33K
[ ]Packages.gz30-Mar-2011 23:08 7.7K
[DIR]build/05-Dec-2009 16:45 -
[ ]finch-dev_2.5.5-1-loc1_all.deb09-Dec-2010 20:37 162K
[ ]finch_2.5.5-1-loc1_i386.deb09-Dec-2010 20:37 333K
[ ]kvm-source_72+dfsg-5~lenny3-loc3_all.deb09-Dec-2010 20:37 155K
[ ]kvm_72+dfsg-5~lenny3-loc3_amd64.deb09-Dec-2010 20:37 1.1M
[ ]libpam-thinkfinger_0.3+r118-0ubuntu4loc1_i386.deb09-Dec-2010 20:37 17K
[ ]libpurple-bin_2.5.5-1-loc1_all.deb09-Dec-2010 20:37 137K
[ ]libpurple-dev_2.5.5-1-loc1_all.deb09-Dec-2010 20:37 282K
[ ]libpurple0_2.5.5-1-loc1_i386.deb09-Dec-2010 20:37 1.6M
[ ]libservlet2.5-java-doc_6.0.20-7loc1_all.deb09-Dec-2010 20:37 245K
[ ]libservlet2.5-java_6.0.20-7loc1_all.deb09-Dec-2010 20:37 179K
[ ]libthinkfinger-dev_0.3+r118-0ubuntu4loc1_i386.deb09-Dec-2010 20:37 18K
[ ]libthinkfinger-doc_0.3+r118-0ubuntu4loc1_all.deb09-Dec-2010 20:37 74K
[ ]libthinkfinger0_0.3+r118-0ubuntu4loc1_i386.deb09-Dec-2010 20:37 17K
[ ]libtomcat6-java_6.0.20-7loc1_all.deb09-Dec-2010 20:37 2.8M
[ ]maven-repo-helper_0.9-loc1_all.deb09-Dec-2010 20:37 56K
[DIR]php4/09-Aug-2010 03:53 -
[ ]pidgin-data_2.5.5-1-loc1_all.deb09-Dec-2010 20:37 6.9M
[ ]pidgin-dbg_2.5.5-1-loc1_i386.deb09-Dec-2010 20:37 5.3M
[ ]pidgin-dev_2.5.5-1-loc1_all.deb09-Dec-2010 20:37 1.4M
[ ]pidgin_2.5.5-1-loc1_i386.deb09-Dec-2010 20:37 689K
[ ]thinkfinger-tools_0.3+r118-0ubuntu4loc1_i386.deb09-Dec-2010 20:37 16K
[ ]tomcat6-admin_6.0.20-7loc1_all.deb09-Dec-2010 20:37 38K
[ ]tomcat6-common_6.0.20-7loc1_all.deb09-Dec-2010 20:37 36K
[ ]tomcat6-docs_6.0.20-7loc1_all.deb09-Dec-2010 20:37 482K
[ ]tomcat6-examples_6.0.20-7loc1_all.deb09-Dec-2010 20:37 411K
[ ]tomcat6-user_6.0.20-7loc1_all.deb09-Dec-2010 20:37 21K
[ ]tomcat6_6.0.20-7loc1_all.deb09-Dec-2010 20:37 26K
[ ]ttf-symbol-replacement_1.2.2-0ubuntu1loc1_all.deb09-Dec-2010 20:37 57K
[ ]wine-dev_1.2.2-0ubuntu1loc1_all.deb09-Dec-2010 20:37 39K
[ ]wine-gecko_1.2.2-0ubuntu1loc1_all.deb09-Dec-2010 20:37 39K
[ ]wine1.2-dbg_1.2.2-0ubuntu1loc1_i386.deb09-Dec-2010 20:37 40K
[ ]wine1.2-dev_1.2.2-0ubuntu1loc1_i386.deb09-Dec-2010 20:37 2.1M
[ ]wine1.2-gecko_1.0.0-0ubuntu4loc1_i386.deb30-Mar-2011 23:06 7.7M
[ ]wine1.2_1.2.2-0ubuntu1loc1_i386.deb09-Dec-2010 20:53 16M
[ ]wine_1.2.2-0ubuntu1loc1_all.deb09-Dec-2010 20:53 39K
Apache/2.2.9 (Debian) Server at www.cecak.cz Port 80