Dialog Not Clearing

Dialog Not Clearing

The Code:

$("#iframe-modal-pic").attr("src",openUrl).dialog({
                       open: function(){
                           $(this).css('width','95%');
                       },        
                       modal: true,
                       title: crew + ' Duty Records',
                       width: 400,
                       height: 300,
                       buttons:{
                           Close: function(){
                               $(this).dialog().empty();
                               $(this).dialog('close');}
                       }
                   });

On subsequent openings in FF the content is clear.  But in IE I see the last content until the data is loaded via the openUrl. 

How can I be sure the HTML is cleared in IE.  I tried .html("") and both browsers displayed the previous content.   .empty() is working in FF but not in IE.

Thanks,
Bill