check if an image is fully loaded on webpage

my code is like this:

set obj=Browser("name:=Blackboard.*").Page("title:=Blackboard.*").Frame("name:=main.*").object.all.tags("IMG")

msgbox obj.length

For each element in obj
s1=element.nameProp

If Browser().Page().Frame().Image("file name:="&s1,"index:=0").exist(0) then
If Browser().Page().Frame().Image("file name:="&s1,"index:=0").Object.complete="True" then

msgbox "pass"

else
msgbox "fail"

end if
end if

Next