how to replace 20% to - or underscore in theard url?

[Qleb]

ok

i need to replace the theard URL to the title

whatever ,ill give u example for forum title

if i need to replace the forum URL with forum title

i modifyed forumhome_forumbit_level1_nopost

the forum orginal url is

PHP Code:

forumdisplay.php?$session[sessionurl]f=$forum[forumid] 


after

PHP Code:

f-$session[sessionurl]$forum[title].html 


then its appers ike this

/games%20section.html

i need it to appears like this

/games-section.html

how to do this ?