Php flp?

[CallMeContrary]

So I grabbed a snippet of code off of someone's mule account while going through the forums. I remember when this first came up someone had a guide out for it and it was pretty genius. I thought so anyway. But anyway, how do I go about rebuilding this into a functioning popup? My coding skills are pretty rusty...

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EDIT:
As an afterthought, if someone has extra time/patience to show me how to do coding and stuff I'd appreciate it.