posting only default values

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Javascript

hey guys this should be a straightforward thing but for some reason it doent work for me
Im updating the image witha new one and when I submit the form to PHP the image reads the default image location not the newly updated one. does someone klnow what I am doing wrong? THANKS IN ADVANCE!

here is the image

<img id="display_imd" name="display_imd" src="$imagelink2" style="width: 280px; height: 253px;" />

here is my submit button

<input type="submit" onclick="document.editrecs.submit();" class="btnLogin" name='btnsaveeditrecipe' value="Save Changes" />

here is my script

document.getElementById("display_imd").src=httpRequest.responseText;