[TYPO3] TYPO3 EXT $_GET question

[Rocky]

Hey,

I'm doing an EXT which pulls the records from extension table and show 
them in the frontend. The records are written through the HTML form in 
the frontend. Each record will render in an line. Following each record 
shown in frontend in HTML format there is a link says "edit". When the 
visitor click on the edit they will be able to see the HTML form with 
there old information in the input and textarea. Can I use the following 
code? Or there's a better way of doing this?

if($_GET['edit']){
content='
//render the form
';
}

Thanks a lot in advance!
Rocky