diff --git a/webif/html/browse/index.jim b/webif/html/browse/index.jim
index 9c27973..2c8266d 100755
--- a/webif/html/browse/index.jim
+++ b/webif/html/browse/index.jim
@@ -69,7 +69,7 @@ proc directory {file bfile tbfile} {
 	puts "<a class=dbf
 	    href=\"$::env(SCRIPT_NAME)?dir=[cgi_quote_url $file]\"
 	    file=\"[cgi_quote_html $file]\">"
-	puts "$bfile</a><span class=filesize id=\"$tbfile\">
+	puts "[string map {" " &nbsp;} $bfile]</a><span class=filesize id=\"ID$tbfile\">
 		</span>"
 
 	lassign [dir iconset $file] icons attrs
@@ -106,13 +106,12 @@ proc entry {file} {{i 0}} {
 	global dircount filecount dinuse
 
 	set bfile [file tail $file]
-	regsub -all " +" $bfile "" tbfile
 	if {[string index $bfile 0] == "\025"} {
 		set bfile [string range $bfile 1 end]
 	}
 	if {[file isdirectory "$file"]} {
 		incr dircount
-		directory $file $bfile $tbfile
+		directory $file $bfile [b64uencode [jsescape $bfile]]
 		return
 	}
 	set ext [string tolower [file extension $file]]
diff --git a/webif/html/browse/script.js b/webif/html/browse/script.js
index 28ad4b1..cec02bb 100755
--- a/webif/html/browse/script.js
+++ b/webif/html/browse/script.js
@@ -111,8 +111,13 @@ function epginfo_callback(data, status, xhr)
 
 function insert_folder_size(folder, size)
 {
-	folder = folder.replace(/ /g, '');
-	folder = folder.replace(/([ #;&,.+*~\':"!^$[\]()=>|\/@])/g, '\\$1');
+	// folder = folder.replace(/([ #;&,.+*~\':"!^$[\]()=>|\/@])/g, '\\$1');
+	// ID of size element is ID + RFC4648 s5 encoding of folder name
+	folder = "ID" + 
+             btoa(escape(folder))
+                     .replace(/\+/g, '-')
+                     .replace(/\//g, '_')
+                     .replace(/=/g, '');	
 	//console.log("Folder: (%s) = (%s)", folder, size);
 	if (size.search(/\d$/) == -1)
 		size += 'iB';
diff --git a/webif/lib/utils b/webif/lib/utils
index 53eaf04..e9b794b 100644
--- a/webif/lib/utils
+++ b/webif/lib/utils
@@ -20,3 +20,98 @@ proc midnight {} {{today ""}} {
 	return [clock scan "$today 00:00:00" -format "%Y %m %d %T"]
 }
 
+# Base-64 according to RFC 4648
+# See https://wiki.tcl-lang.org/page/base64
+
+if {![exists -command binary]} { package require binary }
+
+# RFC 4648 section 4
+set  ::b64::map {
+        000000 A 000001 B 000010 C 000011 D 000100 E 000101 F
+        000110 G 000111 H 001000 I 001001 J 001010 K 001011 L
+        001100 M 001101 N 001110 O 001111 P 010000 Q 010001 R
+        010010 S 010011 T 010100 U 010101 V 010110 W 010111 X
+        011000 Y 011001 Z 011010 a 011011 b 011100 c 011101 d
+        011110 e 011111 f 100000 g 100001 h 100010 i 100011 j
+        100100 k 100101 l 100110 m 100111 n 101000 o 101001 p
+        101010 q 101011 r 101100 s 101101 t 101110 u 101111 v
+        110000 w 110001 x 110010 y 110011 z 110100 0 110101 1
+        110110 2 110111 3 111000 4 111001 5 111010 6 111011 7
+        111100 8 111101 9 111110 + 111111 /
+}
+
+set ::b64::unmap [join [lmap {a b} $::b64::map {list $b $a}]]
+
+proc ::b64::encode {str} {
+    binary scan $str B* bits
+    switch [expr {[string length $bits]%6}] {
+        0 {set tail {}}
+        2 {append bits 0000; set tail ==}
+        4 {append bits 00; set tail =}
+    }
+    return [string cat [string map $::b64::map $bits] $tail]
+}
+
+proc ::b64::decode {str} {
+    set nstr [string trimright $str =]
+    set dstr [string map $::b64::unmap $nstr]
+    switch [expr [string length $str]-[string length $nstr]] {
+        0 {#nothing to do}
+        1 {set dstr [string range $dstr 0 {end-2}]}
+        2 {set dstr [string range $dstr 0 {end-4}]}
+    }
+    return [binary format B* $dstr]
+}
+
+# RFC 4648 section 5
+proc ::b64::url_encode {str} {
+    tailcall string map {+ - / _ = ""} [::b64::encode $str]
+}
+
+proc ::b64::url_decode {str} {
+    tailcall ::b64::decode [string map {- + _ /} $str]
+}
+
+alias b64encode ::b64::encode
+alias b64decode ::b64::decode
+alias b64uencode ::b64::url_encode
+alias b64udecode ::b64::url_decode
+
+
+# ECMA-262 Annex B.2.1
+proc ::js::_escape {str} {
+	return [join [lmap c [split $str ""] {
+			if {1 != [scan $c "%c" cc]} {
+				format "%s" $c
+			} elseif {$cc < 256} {
+				format "%%%02X" $cc
+			} else {
+				format "%%u%04X" $cc
+			}
+		}] ""]
+}
+
+proc ::js::_unescape {str} {
+	if {1 == [scan $str "%%%2x" cc] ||
+	    1 == [scan $str "%%u%4x" cc]} {
+		return [format "%c" $cc]
+	} else {
+		return $str
+	}
+}
+
+proc ::js::escape {str} {
+	return [subst -nobackslashes -novariables \
+		[regsub -all -- {[^A-Za-z0-9@*_+-./]+} $str \
+			{[::js::_escape "&"]}]]
+}
+
+proc ::js::unescape {str} {
+	return [subst -nobackslashes -novariables \
+		[regsub -all -- {%(u[[:xdigit:]]{2})?[[:xdigit:]]{2}} $str \
+			{[::js::_unescape "&"]}]]
+}
+
+alias jsescape ::js::escape
+alias jsunescape ::js::unescape
+