java script error when selecting account name for new contact

i get this java script error: "window.opener.EditView is undefined"
and is pointing to this code: "window.opener.EditView.accid.value=accid;"
in this file: inc/acclist.asp (line 12)

i get the above error whenever i select (click select button) an account name from the pop up window whenever i have to add a new contact. It worked before but now it doesn’t. the pop up window for the account names doesn’t even close.