[web2py] {{=URL(...)}} helper in javascript function

[Vineet]

I am trying to use jquery-ui for modal form & dialog.
In a confirmation dialogue, on click event, i want to call a
controller action.
Notice the code for Delete button handler.

[CODE]
$(document).ready(function() {
$('.delurl').click(function(e){
 $("#deptDel").dialog({
       modal: true,
       buttons: {
                "Delete": {{=URL('controller_name', args=[a,b,..])}}

                "Cancel": function() {
                    $( this ).dialog( "close" );
[/CODE]

Is it all right to use URL helper in javascript function
OR
is there any downside in coding like this?
If so, what is the best practice for such requirement?

Thanks,
Vineet