[2005] access form by variable or mdichildren

[luckyboy]

hello all. If i have name of form(frm1) in a variable (frm_str as string), can i access to the variable like the form? or if i already know the parent of frm1, can i access to it by mdichildren?
Ex:

dim frm_str as string
frm_str=frm1.name
...
...
...
...
...
frm_str.Show  'this is frm1 actually

or 

dim frm_str as string
frm_str=frm1.name
frm1.mdiparent=MainForm
...
...
...
...
...
MainForm.MdiChildren(frm_str).show

any idea? many thank for ur help.