window.onload = function(){
    setTimeout(function(){ //fix for IE event detachment with swfaddress
       var login_link = window.document.getElementById('link_login');
       var login_btn = window.document.getElementById('img_login');
       login_btn.onmousedown = function(){
          login_btn.setAttribute('src','_images/btn-login-on.gif')
       }
       login_btn.onmouseup = function(){   
          login_btn.setAttribute('src','_images/btn-login.gif');
       }
       login_btn.onmouseout = function(){
          login_btn.setAttribute('src','_images/btn-login.gif')
       }
   },500);
}