Sed: remove block of text

Example code:

var gdjfgjfgj235f = 1; var d=document;var s=d.createElement('script'); s.type='text/javascript';
(...)
d.getElementsByTagName('head')[0].appendChild(s);
}

Sed:

sed -i ‘/^var gdjfgjfgj235f/,/^}/d’ $file

sed -i ‘/^d.getElementsByTagName(.*head.*appendChild/,/^}/d’ $file