This is probably being caused by one of three things:
Check that there is are {literal} and {/literal} Smarty tags before and after any JavaScript code in your template files. This will ensure that the Smarty template engine ignores the curly braces in your code. See lines 2 and 6 in this example:
<script>
//{literal}
var foo = function bar () {
alert('This function is escaped because the JavaScript code contains curly braces.');
}
//{/literal}
</script>
Ensure that the permissions on the directories 'cache' and 'templates_c' in resources/smarty/ are set to '777' (read/write/execute) for all users.
Try switching to the default design theme 'Charcoal' that comes with the software. If you've edited any of the template files that came with the script, make sure that your Smarty tags are correctly formatted with no mismatched curly braces.
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