How to make a custom URL

Suppose my URL like "http://localhost/news/Slavo/virsion/sitefinity-sdk-was-released".

i want to display this url like "http://localhost/news/Slavo/006".

How can i do this..?

actually i want to use this solution when i setect a option to goto a new page.

<script type="text/javascript">

    function changeFunc() {
        var selectBox = document.getElementById("selectBox");
        var selectedValue = selectBox.options[selectBox.selectedIndex].value;
        // alert(selectedValue);
        if( selectedValue =="Others"){
            alert(selectedValue);
            // goto a new page;
            $url  = "http://localhost/new/select_university.php";
            $replace = array("http://localhost/new/", ".php");
            $by   = array("http://localhost/new/NewPage", ".php");


            $newurl = str_replace($replace, $by, $url);
            window.location.href = $newurl;
        }
    }



<select id="selectBox" onchange="changeFunc();">
    <option value="001">001</option>
    <option value="002">002</option>    
    <option value="Others">Others</option>
</select>