jquery jDialog deson't work properly when we call it many times

jquery jDialog deson't work properly when we call it many times

I'm using jdialog, everything works fine, but when I show up the same div
many times it freezes, if i refresh the page everything works fine again.
I even tried to generate a dynamic id for the div
here the code:
/* * */ function open_jdialog(url, div_id,dialog_title, dialog_width,
dialog_height,top_position) { try { if (trim(div_id)=="") {
div_id="host_div_id" }
if (typeof(top_position)==='undefined')
{
top_position=100
}
host_div=document.getElementById(div_id)
key=generate_key();
host_div.innerHTML="<div id=" + key + "></div>"
url=url + "&div_to_close=" + key
get_data_via_ajax( url ,key)//get
//
if (dialog_width==0) dialog_height="auto"
if (dialog_height==0) dialog_height="auto"
//
$("#" + key).dialog({
width: dialog_width,
height: dialog_height,//$(window).height(),
modal: true,
title:dialog_title,
position: ["centre",top_position],
zIndex: 0,
});
$('#' + key).bind('dialogclose', function(event)
{
document.getElementById(div_id).innerHTML=""
//document.getElementById(div_id).reset();
});
}//end try
catch(err)
{
}
}