[fix bug 1369047] Fix JS error in sub-nav.js on IE8
[fix bug 1369047] Fix JS error in sub-nav.js on IE8

mozilla/bedrock,craigcook/bedrock,pascalchevrel/bedrock,craigcook/bedrock,hoosteeno/bedrock,MichaelKohler/bedrock,gerv/bedrock,kyoshino/bedrock,alexgibson/bedrock,schalkneethling/bedrock,mozilla/bedrock,gerv/bedrock,hoosteeno/bedrock,craigcook/bedrock,pascalchevrel/bedrock,mkmelin/bedrock,mkmelin/bedrock,sylvestre/bedrock,sylvestre/bedrock,sgarrity/bedrock,kyoshino/bedrock,schalkneethling/bedrock,kyoshino/bedrock,gerv/bedrock,kyoshino/bedrock,alexgibson/bedrock,ericawright/bedrock,sylvestre/bedrock,mkmelin/bedrock,ericawright/bedrock,ericawright/bedrock,mozilla/bedrock,MichaelKohler/bedrock,schalkneethling/bedrock,pascalchevrel/bedrock,alexgibson/bedrock,alexgibson/bedrock,gerv/bedrock,sylvestre/bedrock,flodolo/bedrock,sgarrity/bedrock,pascalchevrel/bedrock,sgarrity/bedrock,MichaelKohler/bedrock,flodolo/bedrock,ericawright/bedrock,MichaelKohler/bedrock,hoosteeno/bedrock,mkmelin/bedrock,schalkneethling/bedrock,craigcook/bedrock,flodolo/bedrock,mozilla/bedrock,flodolo/bedrock,sgarrity/bedrock,hoosteeno/bedrock