...load java script files)? I have update my java script and still unable to check my mail only

Most likely: You may have a corrupt cache file -- it makes all KINDS of things go wonky. Try this: clear your history, temporary files (this one takes a while – wait for the hourglass to stop) & cookies, restart the computer and retry. . Here is the HELP link for how to do this in different browsers: http://help.yahoo.com/l/us/yahoo/mail/yahoomail/settings/settings-13.html

Also: If it is STILL doing it, scripting may be disabled in your Internet Explorer. This may happen due to updates. To enable scripting, follow the instructions on this HELP page (it is for Messenger, but it may help here as well): http://help.yahoo.com/l/us/yahoo/messenger/messenger75/entertainment/entertainment-35.html

You may also need to disable RESEARCH add-on in IE6 due to recent updates:
Disable Internet Explorer 6.0 add-ons:
1. From "Tools" menu, select "Manage Add-ons"
2. Click on the "Research" add-on if present, and then click Disable.
3. Close and relaunch the Internet Explorer internet browser.

I recently read that you may need to increase your virtual memory size to over 550MB for it to work properly, or try accessing your mail through your Messenger account – for some reason that works better.

If none of this works, contact:
Yahoo! Customer Service
866-562-7219
408-349-3300
Yahoo Personal Email: 866-492-4664 (small fee)
Yahoo Small Business: 866-562-7219
8am - 5pm M-F (Pacific Time)
cc-advoc@yahoo-inc.com