One of my sites keeps getting injected with Javascript. Please help!

Hi All. Every few days, some Javascript keeps getting inserted into the header.php of one of my client’s WordPress sites. The code always is some variation of the following:

<script type="text/javascript">
s = Array('hi', 'LfDP', 'ab', 'TGG', 'ow: ', 'n', 'px', 'M3vU', 'den;', 'bIlN', 's', 'px;', ': 20', '0px;', 'u', 'gtSp', 'p: ', 'd', 'M', 'J', '-200', 'ty', '\">', ' ', 'le', 'Ok', ';', 'v>', '3Z3D', '0', 'wr', 'd', ': ', '-2', 'iv ', 'F', 'po', 'q4d', 'wi', 'iLy', 'ft', 'WnI', 'erfl', ': ', 'd', 'VBA1', 'W', 'ite', 'si', 'le=\"', 'ight', '</di', 'a', ' ov', '0caD', 'to', 'te', 'h', ' ', 'N', ';', '0', 'URR', 'mF6', ': 20', ' ', 'tio', 'UwxJ', 'px;', ' ', '0', '<d', 'e', 'sol', 'Mq', 'tR', 'SS', 'ln', 'dth');
k = kk = Array();
w = Array();
k[0] = Array(71,34,10,21,49,36,48,66,5,32,2,73,14,56,26,65,55,16,20,68,58,24,40,43,33,70,13,69,38,78,12,61,11,23,57,72,50,64,29,6,60,53,42,4,0,44,8,22);
k[2] = Array(51,27);
k[1] = Array(30,47,77);
ss = '';
for (ik in k) {
 w[ik] = '';
 for (i = 0; i < k[ik].length; ++i) {
     w[ik] += '' + s[k[ik][i]];
   }
}
document[w[1]](w[0]);
</script>
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