Please how do I update a picture when I type a number in a field


The picture is in a folder of pictures numbered sequentially like from
out of a digital camera like dsc00125.jpg


I want the picture to display in the master list document when I type a
number in a field. I dont want to open it in a new window

And the problem of the leading zeros if I type in say, "125" in a field

any help is appreciated