Ever since I switch to the new yahoo mail I have had many problems w/ delete and in trying to switch back?

I just want to go back to old email style but I can't even do this. I select the go back to clic mail and it say's "javascript void 0", what ever that means. I just want to use my email account as I once could. Hell I have even put in complaints to yahoo (x3) and still nothing has been resolved. I can not delete or send junk mail to report spam. my email are constantly loading and I have 100 or more I haven't even been able to access. Anyone got any idea's cause this is irritating and has been going on ever since I switch to the new improved email set-up of which, was over 2 weeks ago. I don't care about fixing problems on this new set-up NOW, I just want my old reliable set-up. needing help..........thanx, tem