Fix JavaScript error in IE8 when viewing documentation.
Fix JavaScript error in IE8 when viewing documentation.

leafo/prototype,Jiasm/prototype,erpframework/prototype,Jiasm/prototype,sdumitriu/prototype,erpframework/prototype,Gargaj/prototype,Jiasm/prototype,292388900/prototype,ShefronYudy/prototype,loduis/prototype,fashionsun/prototype,baiyanghese/prototype,ridixcr/prototype,ridixcr/prototype,sstephenson/prototype,292388900/prototype,lamsieuquay/prototype,ShefronYudy/prototype,sdumitriu/prototype,Gargaj/prototype,lamsieuquay/prototype,sdumitriu/prototype,ridixcr/prototype,leafo/prototype,Gargaj/prototype,baiyanghese/prototype,fashionsun/prototype,ShefronYudy/prototype,ldf7801528/prototype,ldf7801528/prototype,fashionsun/prototype,lamsieuquay/prototype,sstephenson/prototype,sstephenson/prototype,292388900/prototype,loduis/prototype,erpframework/prototype,loduis/prototype,ldf7801528/prototype