MS Access VBA: how do I clear Image control? -

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i have image control reads file disk user navigates. if there no file (an empty field), need erase previous image. microsoft page says follows:

sub form_click ()     picture1.picture = loadpicture() end sub

but when it, access complains "the argument not optional"! tried loadpicture("") stated here , here, no avail. says "microsoft access can't open file '0'." how can clear picture in runtime? i'm using access 2002. in advance!

use following:

picture1.picture = ""

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