Hello, i have a problem, i have this html code for login page with a select list.

Code:
  
             <!-- #LOGIN# -->                           

                            

                         	<div id="mobileLoginWrapper"  class="activeMobileMenu mobileOnly">

                                <div id="mobileLogin">

                                    <form action="http://server1.com/index.php?action=loginAvatar&function=login" method="post" name="mobileLoginForm" id="mobileLoginForm">                                    

                                     	<div class="input-wrap">



    <label for="mobileLogServer">server</label>



    

    <select name="uni_url" id="mobileLogServer" class="validate[required]">



        

        

        <option  class=""

                                          value="server1.com"

                                          
                                          cookieName=""                                         

                                          >





                server1

        </option>



            

        <option  class=""

                                          value="server2.com"

                                          cookieName=""                                         

                                          >





                server2

        </option>



            

        <option  class=""

                                          value="server3.com"

                                          cookieName=""                                         

                                          >





                server3

        </option>



            

        <option  class=""

                                          value="server4.com"

                                           cookieName=""                                         

                                          >





                server4

        </option>



            

       

            

    </select>

</div> 



<div class="input-wrap ">

    <label for="mobileLoginName">username</label>

    <input id="mobileLoginName" name="name" 

           type="text" value="" class="validate[required,exemptString[username]]" />

</div> 



<div class="input-wrap ">

    <label for="mobileLoginPassword">password</label>

    <input id="mobileLoginPassword" name="password" 

           type="password" value="" class="validate[required,exemptString[password]]" />

</div>                                        <div class="input-wrap noBG">                                            

                                            <div class="button-wrap">

                                               
                                            </div>                                        

                                            <input type="hidden" value="" name="kid" id="mobileLoginKid"/>

                                            <button class="btn-login" id="mobileLoginBtn" type="submit">submit</button>

                                            

											                                        </div>

                                    </form>

                                </div>

                            </div>

                            
</html>
but i want to make it dynamic with javascript, for example when the user selects server3, at the form
Code:
<form action="http://server1.com/index.php?action=loginAvatar&function=login" method="post" name="mobileLoginForm" id="mobileLoginForm">
to send the login to server3 and when another user selects server2 to send the login form to server2.
Any help please?