[lsch]fixed js bug for ie 7
[lsch]fixed js bug for ie 7

Chilledheart/seahub,cloudcopy/seahub,madflow/seahub,Chilledheart/seahub,madflow/seahub,Chilledheart/seahub,miurahr/seahub,Chilledheart/seahub,cloudcopy/seahub,cloudcopy/seahub,miurahr/seahub,madflow/seahub,Chilledheart/seahub,miurahr/seahub,madflow/seahub,miurahr/seahub,madflow/seahub,cloudcopy/seahub