send ichat file question

tell application "System Events"
	tell application "iChat" to activate
	keystroke "f" using {command down, option down}
	delay 1
	keystroke "/" using control down
	delay 1
	tell window "Buddy List"
		tell sheet 1
			set value of text field 1 to file WHAT GOES HERE
			click button 1
		end tell
		click button 1
	end tell
end tell

i cant figure out how to make a specific file path go there so that i can open a specific file
for example i want to open an image thats in this path “users/~/desktop/newfolder/dc.jpg”

no help on the filepath?

This worked for me

activate application "iChat"
tell application "System Events"
	tell process "iChat"
		keystroke "f" using {command down, option down}
		delay 1
		keystroke "/" using control down
		delay 1
		tell window "Go To Folder"
			set value of text field 1 to "~/Desktop/newfolder/dc.jpg"
			click button "Go"
		end tell
		click button "Open" of sheet 1 of front window
		keystroke return
	end tell
end tell