[TYPO3-english] Need help Image Links wrap

[Mam Violeng]

Hi all,

I've created my own extension to add one more field in the tt_content, 
this field will allow the user to choose the file (like "Images" 
property) to show when click-enlarge, but I don't know how can I write 
typoscript to make image link to this field instead of link to the 
images in the "Images" (original images). My current typoscript is

tmp = TEXT
tmp {
    typolink.parameter.field = tx_modifyimagelink_image_link //new field
    typolink.parameter.listNum.splitChar = ,
    typolink.parameter.listNum.stdWrap.data = register:SPLIT_COUNT
}

tt_content.textpic.20.1.imageLinkWrap < tmp

and the images will upload to folder "uploads/pics"

Thank in advance for your solutions.

Best,

Violeng Mam