Macro For Popup Message

Hai
I Need a Macro Which will filter & show me a popup message with "Cell Value C - Purchase Order To be Raised" when the following condition is true
1.Cell Value Column L = (65% of E)
2.Cell Value Column M = Yes

I don't want the Popup Message to appear when the Cell Value Column M = No

Regards
Mani

Hi Mani
the attached may give you a start.
barry