[derfelix]

well I was looking for the same solution...
What i did
i placed a flag on the page and

linked it with the following code:

PHP Code:

<a href="javascript:switch_lang(1);"><img src="images/flag_english.gif" border=0 /></a> 


in switch_lang(1) the 1 is your language id corresponding to the language..
you have to change it for the language corresponding to the flag !!!!!

then open forum/clientscript/vbulletin_global.js
in there find:

PHP Code:

function switch_id(selectobj, type) 


and ABOVE add:

PHP Code:

function switch_lang(language)
{
    var id = language;

    if (id == '')
    {
        return;
    }

    var url = new String(window.location);
    var fragment = new String('');

    // get rid of fragment
    url = url.split('#');

    // deal with the fragment first
    if (url[1])
    {
        fragment = '#' + url[1];
    }

    // deal with the main url
    url = url[0];

    // remove id=x& from main bit
    if (url.indexOf('langid=') != -1 && is_regexp)
    {
        re = new RegExp("langid=\\d+&?");
        url = url.replace(re, '');
    }

    // add the ? to the url if needed
    if (url.indexOf('?') == -1)
    {
        url += '?';
    }
    else
    {
        // make sure that we have a valid character to join our id bit
        lastchar = url.substr(url.length - 1);
        if (lastchar != '&' && lastchar != '?')
        {
            url += '&';
        }
    }

    window.location = url + 'langid=' + id + fragment;
} 


I hope that helps

Felix