Is class level variable accessible in Javascript function?

[vaibhav punekar]

I m trying to use the String variable defined at tha class level that stores the value fetched form tthe database.suppose 'login'.Now I m comparing this 'login' in Javascript fn,to give the error message in case the 'login' already exists.It is giving error that 'loginname' not defined.Can't I use servlet variable in Javascript fn.Is their any simpler way to achieve this validation?Thanks.