My spreadsheet works in excel 2010 but doesnt in 2007

[Ayoub99k]

I designed a macro where by if i enter the word ET in a cell, a picture appears. This works fine when i am using excel 2010. But when i use 2007, i get the pop up message run time error and the program will not display the picture when i type ET.

Here are some of the errors i get: http://prntscr.com/8w0tqr
I really wish for them to be made compatible for all versions of excel

Any reason for this and how to fix?