MySQL select between dates leaving blank -

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i'm trying search.

and there input startdate , 1 finaldate.

but person might not type start or final date or neither...

im trying use: 

(data between ".$startdate." , ".$finaldate.")

leaving blank it's not working, unless put start , final dates.

i wanted if person doesn't type dates, keeps searching rest.

is possible?

==edited per request==

put before sql query:

if(empty($finaldate)) $where = "(data >= ".$startdate.")"; else if(empty($startdate)) $where =  "(data <= ".$finaltdate.")";    else $where = "(data between ".$startdate." , ".$finaldate.")";

and change 

(data between ".$startdate." , ".$finaldate.")

with

".$where."

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