actionscript 3 - Action Script 3. How to set background -

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i'm creating flash game, here restart button , have function delete objects (children) stage.

function restartgame(e:mouseevent):void {     while (numchildren > 0) {         removechildat(0); } addchild(_cards);  //here need add background      startmemorygame();  }

at normal don't need add background, when game started added automatic. in library called background.jpg, converted graphic , named background added linkage "background" addchild(background); doesn't work me. me? thank you.

i assuming set linkage on image, in case go :

var background:bitmap = new bitmap(new background); addchild(background);

if it's movieclip symbol linkage set, can :

var background:background = new background; addchild(background);

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