when I click external link (outside fck) open "add image"

hi all.
for example this region FCK
*****************
bla bla bla
bla bla bla
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this region my html page content( I added link) (bottom of fck)
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<a href="#" onclick="............" > add image </a>
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I want, when I click link, open "add image window"
How can I.