Scratch

I am creating a project that uses the stamp block.  When I try to stamp on another sprite, the stamp mark goes behind the sprite.  How do I make the stamp appear on top of other sprites. 

This is my current code for the design sprite:
[block]
<when[design1  ]clicked>
<set{design1  }to( 1
<forever>
<go to[ stamper



<when I receive[ stamp1
<go to front>
<stamp>
[/block]

This is my current code for the stamper sprite:
[block]

<when green flag clicked>
<forever>
<if>
<( <{ design1 }> <=> 1 )>
<go to[ mouse-pointer
<else>
<go to x:(140  )y:(155



<when green flag clicked>
<forever if><< <(  <{ design1 }><=> 1 )> <and> <mouse down?> >>
<broadcast[stamp1
[/block]




all this does is leave a stamp forever without clicking the mouse.