fixed: add alert & double-click prevention while submitting answers
Merge branch 'watui' of https://github.com/skim-ks/edx-platform-1 into watui
Merge branch 'watui' of https://github.com/skim-ks/edx-platform-1 into watui
Merge branch 'watui' of https://github.com/skim-ks/edx-platform-1 into watui
Merge pull request #51 from skim-ks/watui

fixed problem.html