[TECK]

functions.php
Find the code:

PHP Code:

// ###################### Start makeforumjump #######################
$frmjmpsel = array();
function makeforumjump($forumid=-1,$addbox=1,$prependchars="",$permission="") {
  global $DB_site,$optionselected,$usecategories,$jumpforumid,$jumpforumtitle,$jumpforumbits,$curforumid, $daysprune; 


Replace it with:

PHP Code:

// ###################### Start makeforumjump #######################
$frmjmpsel = array();
function makeforumjump($forumid=-1,$addbox=1,$prependchars="",$permission="") {
  global $DB_site,$optionselected,$usecategories,$jumpforumid,$jumpforumtitle,$jumpforumbits,$curforumid, $daysprune,$bburl; 


forumjump template (2 changes)
1. Find the code:

<form action="forumdisplay.php" method="get">

Replace it with:

<form action="$bburl/forumdisplay.php" method="get">

2. Find the code:

<select name="forumid"
	onchange="window.location=('forumdisplay.php?s=$session[sessionhash]&daysprune=$daysprune&forumid='+this.options[this.selectedIndex].value)">

Replace it with:

<select name="forumid"
	onchange="window.location=('$bburl/forumdisplay.php?s=$session[sessionhash]&daysprune=$daysprune&forumid='+this.options[this.selectedIndex].value)">

-------------------
in home template, use the [high]$forumjump[/high] variable to call your drop-down.

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index.php (homepage)
Add:

PHP Code:

makeforumjump(); 


in the area marked to add your vBulletin code.

let me know if that helps..