Urgent please... IE hangs after repeating a particular scenario 3-4 times!

Urgent please... IE hangs after repeating a particular scenario 3-4 times!

On a web page i have one button. On clicking this button a popup window opens up, displaying an asynchronous tree i.e. lazy loading. The strings in the tree are retrieved from the database and using 'jquery' the tree is displayed.
 
All the nodes of the tree are in the form of links. On clicking on any link, the popup window closes and the selected string is displayed in the textbox on the main page.
 
On repeating this 3-4 times, i.e. on opening the popup window and selecting any string of the tree, IE hangs! The popup window is blank and it seems that it is trying to load the page but does not do so. It waits indefinitely. Moreover all the links on the site stop working. (All the links pertaining to any 'request to the server' stop working).
 
popup.asp:
<html> <head> <title> </title> <!-- #include virtual="/config/Data.asp" --> <script type="text/javascript"> $(document).ready(function(){ $("#black").treeview({ url: 'ASPfile.asp?fName=<%=Request.QueryString("fName")%>&fType=<%=Request.QueryString("fType")%>', control:"#treectrl" }) }); </script> </head> <body style="background-color:#fcfefd;font-size:1" > <div class="titleOfPage"><font face="Verdana" size="3"> </font></div> <br /> <font face="Verdana" size="2"> <div id = "tree_popup"> <div id="treectrl"></div> </div> <br /> <ul id="black"> </ul> </font> </body> </html> 
ASPfile.asp displays the tree.
Please help! Thanks.