MSIE fix for Not a Number issue in jquery-1.2.6.min.js in line 23 char 1286
Error described in http://jquery.10927.n7.nabble.com/Dialog-error-in-Internet-Explorer-6-td122924.html
Fix taken from http://jquery.10927.n7.nabble.com/Dialog-error-in-Internet-Explorer-6-tp122924p122942.html
Inserted fragment:
start=(isNaN(start))?0:start;