Design Studio call to third party application

I am trying to display some images maintained in FolderView. I am told that the DLLs are installed and registered on the Lawson server. Once that is is place, is it just a simple function call to the DLL with the appropriate parameters ?

For instance, the first call is a login that looks like this:

var retVal = document.all.fv.Logon(document.all.userID.value, document.all.password.value);

where "fv" is the object registeted.  I put in this as part of a pusbutton_onclick function

I went into the source and added this:

Should this be enough? Or is there more to it than this ?

TIA

Ragu

LSF9/ DS 9.x