help required

Hi all,
I don't know why below given script doesn't work.
Pls help.
This mel script try to create planar projection on selected geometry.

bye..
*I**************************************************************************



string $nodes[];
 		$nodes = `selectedNodes`;

 		// Return dag objects only
 		string $dagnodes[];
		string $dagnode;
 		$dagnodes = 'selectedNodes -dagObjects';
//		$dagnode= strip(stringArrayToString($dagnodes,""));

//		polyProjection -ch 1 -type Planar -ibd on -icx 0.5 -icy 0.5 -ra 0
-isu 1 -isv 1 -md b $dagnode;


polyProjection -md b $dagnode;