function getPrice(value) {                                                                                                               
    var req = new JsHttpRequest();                                                                                                     
    req.onreadystatechange = function() {                                                                                              
        if (req.readyState == 4) {                                                                                                     
                document.getElementById('dest_price').innerHTML = req.responseText;                                                      
        }                                                                                                                              
    }                                                                                                                                  
    req.open(null, 'ajax/_get_price.php', true);                                                                                   
    req.send( { call_to: value } );                                                                  
}