How to get a return value in a jquery function for a dynamic div?

How to get a return value in a jquery function for a dynamic div?

Hi I wonder how I can get a return value from a JavaScript function to a jQuery function. I have dynamic divs that creates each time I push a button and I want to retrieve the new div ID in my jQuery function sow I can get my date pick to drop down.

javascript function to retrieve the new div ID
function currentCustomerDivName()
{
    return "customerDiv" + currentCustomerId();
}

My jQuery function 
$(document).ready(function()
{
    $( "#start_date" ).datepicker();
    $( "#end_date" ).datepicker();
    $( "#dead_line" ).datepicker();
});   

the start_date, end_date and dead_line are static divs that works. The datepicker() calls my calendar.