diff --git a/mercurial/hgweb/hgwebdir_mod.py b/mercurial/hgweb/hgwebdir_mod.py
--- a/mercurial/hgweb/hgwebdir_mod.py
+++ b/mercurial/hgweb/hgwebdir_mod.py
@@ -90,6 +90,18 @@ class hgwebdir(object):
                            "node": nodeid, "url": url}
 
         def entries(sortcolumn="", descending=False, **map):
+            def sessionvars(**map):
+                fields = []
+                if req.form.has_key('style'):
+                    style = req.form['style'][0]
+                    if style != get('web', 'style', ''):
+                        fields.append(('style', style))
+
+                separator = url[-1] == '?' and ';' or '?'
+                for name, value in fields:
+                    yield dict(name=name, value=value, separator=separator)
+                    separator = ';'
+
             rows = []
             parity = 0
             for name, path in self.repos:
@@ -123,6 +135,7 @@ class hgwebdir(object):
                            description_sort=description.upper() or "unknown",
                            lastchange=d,
                            lastchange_sort=d[1]-d[0],
+                           sessionvars=sessionvars,
                            archives=archivelist(u, "tip", url))
                 if (not sortcolumn
                     or (sortcolumn, descending) == self.repos_sorted):
diff --git a/templates/gitweb/map b/templates/gitweb/map
--- a/templates/gitweb/map
+++ b/templates/gitweb/map
@@ -49,7 +49,7 @@ shortlog = shortlog.tmpl
 shortlogentry = '<tr class="parity#parity#"><td class="age"><i>#date|age# ago</i></td><td><i>#author#</i></td><td><a class="list" href="{url}rev/#node|short#{sessionvars%urlparameter}"><b>#desc|strip|firstline|escape#</b></a></td><td class="link"><a href="{url}rev/#node|short#{sessionvars%urlparameter}">changeset</a> | <a href="{url}file/#node|short#{sessionvars%urlparameter}">manifest</a></td></tr>'
 filelogentry = '<tr class="parity#parity#"><td class="age"><i>#date|age# ago</i></td><td><a class="list" href="{url}rev/#node|short#{sessionvars%urlparameter}"><b>#desc|strip|firstline|escape#</b></a></td><td class="link"><a href="{url}file/#node|short#/#file|urlescape#{sessionvars%urlparameter}">file</a> | <!-- FIXME: <a href="{url}diff/#node|short#/#file|urlescape#{sessionvars%urlparameter}">diff</a> | --> <a href="{url}annotate/#node|short#/#file|urlescape#{sessionvars%urlparameter}">annotate</a> #rename%filelogrename#</td></tr>'
 archiveentry = ' | <a href="{url}archive/{node|short}{extension}">#type|escape#</a> '
-indexentry = '<tr class="parity#parity#"><td><a class="list" href="#url#"><b>#name|escape#</b></a></td><td>#description#</td><td>#contact|obfuscate#</td><td class="age">#lastchange|age# ago</td><td class="indexlinks"><a class="rss_logo" href="#url#rss-log">RSS</a> #archives%archiveentry#</td></tr>' 
+indexentry = '<tr class="parity#parity#"><td><a class="list" href="#url#{sessionvars%urlparameter}"><b>#name|escape#</b></a></td><td>#description#</td><td>#contact|obfuscate#</td><td class="age">#lastchange|age# ago</td><td class="indexlinks"><a class="rss_logo" href="#url#rss-log">RSS</a> #archives%archiveentry#</td></tr>' 
 index = index.tmpl
 urlparameter = '#separator##name#=#value|urlescape#'
 hiddenformentry = '<input type="hidden" name="#name#" value="#value|escape#" />'
diff --git a/templates/map b/templates/map
--- a/templates/map
+++ b/templates/map
@@ -46,7 +46,7 @@ filediffparent = '<tr><th class="parent"
 filelogparent = '<tr><th>parent #rev#:</th><td><a href="#url#file/#node|short#/#file|urlescape#{sessionvars%urlparameter}">#node|short#</a></td></tr>'
 filediffchild = '<tr><th class="child">child #rev#:</th><td class="child"><a href="#url#rev/#node|short#{sessionvars%urlparameter}">#node|short#</a></td></tr>'
 filelogchild = '<tr><th>child #rev#:</th><td><a href="#url#file/#node|short#/#file|urlescape#{sessionvars%urlparameter}">#node|short#</a></td></tr>'
-indexentry = '<tr class="parity#parity#"><td><a href="#url#">#name|escape#</a></td><td>#description#</td><td>#contact|obfuscate#</td><td class="age">#lastchange|age# ago</td><td class="indexlinks"><a href="#url#rss-log">RSS</a> #archives%archiveentry#</td></tr>'
+indexentry = '<tr class="parity#parity#"><td><a href="#url#{sessionvars%urlparameter}">#name|escape#</a></td><td>#description#</td><td>#contact|obfuscate#</td><td class="age">#lastchange|age# ago</td><td class="indexlinks"><a href="#url#rss-log">RSS</a> #archives%archiveentry#</td></tr>'
 index = index.tmpl
 archiveentry = '<a href="#url#archive/#node|short##extension|urlescape#">#type|escape#</a> '
 notfound = notfound.tmpl