what does code this do ???

[rickyspires]

hello, im looking at a site someone else built and im not sure what this code does. code anyone point me in the correct direction please. thanks

<div id="contact">
To book contact Harlequin<br />
<span class="bookingTel">UK +44 (0) *******<br />
US&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;877.502.2022
</span>

<span class="enquiryLink"><script type="text/javascript">
//<![CDATA[
<!--
var x="function f(x){var i,o=\"\",ol=x.length,l=ol;while(x.charCodeAt(l/13)!" +
"=48){try{x+=x;l+=l;}catch(e){}}for(i=l-1;i>=0;i--){o+=x.charAt(i);}return o" +
".substr(0,ol);}f(\")59,\\\";NFUYD030\\\\WK330\\\\230\\\\720\\\\]100\\\\500\\"+
"\\200\\\\000\\\\530\\\\010\\\\630\\\\710\\\\400\\\\010\\\\330\\\\310\\\\300" +
"\\\\120\\\\310\\\\310\\\\410\\\\010\\\\520\\\\.;1.:2130\\\\+99< 2$#5<+?ri62" +
"0\\\\k420\\\\z#)0*6abc[IUHX\\\\\\\\O720\\\\W\\\\\\\\WF~120\\\\D|610\\\\X@In" +
"\\\\DGU@500\\\\]QKTQq[530\\\\[USRWXt010\\\\@PW[RZ]220\\\\ADI700\\\\[STJWFPE" +
"N~mqyouqv~cdq771\\\\`pxO}ccb~h~ucvaq8nt220\\\\420\\\\530\\\\620\\\\X%E120\\" +
"\\320\\\\700\\\\430\\\\S320\\\\MRG000\\\\100\\\\t\\\\730\\\\300\\\\330\\\\7" +
"30\\\\I220\\\\310\\\\100\\\\610\\\\720\\\\200\\\\710\\\\;\\\"(f};o nruter};" +
"))++y(^)i(tAedoCrahc.x(edoCrahCmorf.gnirtS=+o;721=%y;i=+y)59==i(fi{)++i;l<i" +
";0=i(rof;htgnel.x=l,\\\"\\\"=o,i rav{)y,x(f noitcnuf\")" ;
while(x=eval(x));
//-->
//]]>
</script></span>
</div>

[Logic Ali]

It generates a mailto: link. A mail form would be far preferable.

[Padonak]

and optionally after changing a couple of symbols this can summon Cthulhu i'd suppose...

[rickyspires]

hmmm - not sure if i understand it still.

is it something that he created or is it something that i can read about and see some examples some place ??

if i need to edit it or recreate it i wont know how.

thanks
ricky