get variable in dialog

[_pi]

i have a contextmenu entry called XML Lister,
its for generating a xml list for a flash slideshow.

when a jpeg has not iptc caption a dialog will ask for a name.
for usability i want to show the picture but i don't know
how to get sb4 string in my xmllister dialog, so that i can scale the picture.

Code:

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typelib GflAx {059321F1-207A-47A7-93A1-29CDF876FDD3} 1.0 1
GflAx.GflAx g._create
str f _caption xmlbody xmltmp; Dir d
str xml=
;<?xml version="1.0"?>
;<mySlideShow>
;CONTENT
;</mySlideShow>
str pic=
;<picture>
;<description>CAPTION</description>
;<source>FILE</source>
;</picture>
foreach f files
,f.format("%s\*" f)
,foreach(d f FE_Dir)
,,g.LoadBitmap(d.FileName(1))
,,if len(g.IPTCCaption)<1
,,,str controls = "3 4"
,,,str e3 sb4
,,,sb4=d.FileName(1)
,,,if(!ShowDialog("xmllister" &xmllister &controls)) ret
,,,xmltmp=pic
,,,xmltmp.findreplace("CAPTION" e3)
,,,xmltmp.findreplace("FILE" d.FileName)
,,,xmlbody.formata("%s[]" xmltmp)
,,else
,,,_s=g.IPTCCaption
,,,xmltmp=pic
,,,xmltmp.findreplace("CAPTION" _s)
,,,xmltmp.findreplace("FILE" d.FileName)
,,,xmlbody.formata("%s[]" xmltmp)
xmlbody.trim
xml.findreplace("CONTENT" xmlbody)        
out xml

xmllister dialog:

Code:

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;\Dialog_Editor
function# hDlg message wParam lParam
if(hDlg) goto messages

;BEGIN DIALOG
;0 "" 0x90C80A44 0x100 0 0 241 135 "XML Lister"
;3 Edit 0x54030080 0x200 2 2 128 12 ""
;1 Button 0x54030001 0x4 4 74 48 14 "OK"
;2 Button 0x54030000 0x4 56 74 48 14 "Cancel"
;4 Static 0x5400100E 0x20000 136 2 98 66 ""
;END DIALOG
;DIALOG EDITOR: "" 0x2010805 "" ""

ret
;messages
if(message=WM_INITDIALOG) DT_Init(hDlg lParam)
;int param=DT_GetParam(hDlg)

sel message
,case WM_INITDIALOG
,ret 1
,case WM_DESTROY DT_DeleteData(hDlg)
,case WM_COMMAND goto messages2
ret
;messages2
sel wParam
,case IDOK DT_Ok hDlg
,case IDCANCEL DT_Cancel hDlg
ret 1

ps. feel free to teach me where my code is too long.
thanks.