function asynPopulateDropdowns()
{

    var queryString;
    queryString = '?';
    
    if (document.getElementById('sc_River').value != '')
    {
     	queryString += 'sc_River=' + document.getElementById('sc_River').value + '&';
    }
    if (document.getElementById('sc_ShipID').value != '')
    {
     	queryString += 'sc_ShipID=' + document.getElementById('sc_ShipID').value+ '&';
    }
    if (document.getElementById('sc_Depart_StartDate').value != '')
    {
     	queryString += 'sc_Depart_StartDate=' + document.getElementById('sc_Depart_StartDate').value+ '&';
    }
    if (document.getElementById('sc_CabinType').value != '')
    {
     	queryString += 'sc_CabinType=' + document.getElementById('sc_CabinType').value+ '&';
    }
    if (document.getElementById('connectionoption').value != '')
    {
     	queryString += 'connectionoption=' + document.getElementById('connectionoption').value+ '&';
    }
    if (document.getElementById('sc_PUP').value != '')
    {
     	queryString += 'sc_PUP=' + document.getElementById('sc_PUP').value+ '&';
    }    
    
    
   // alert('/ajax-advancedsearch-response.aspx' + queryString);

    makeRequest('/ajax-advancedsearch-response.aspx' + queryString);
}