Implode an array with JavaScript?
You can do this in plain JavaScript, use Array.prototype.join:
arrayName.join(delimiter);
Like This:
[1,2,3,4].join('; ')
Array.join is what you need, but if you like, the friendly people at phpjs.org have created implode for you.
Then some slightly off topic ranting. As @jon_darkstar alreadt pointed out, jQuery is JavaScript and not vice versa. You don't need to know JavaScript to be able to understand how to use jQuery, but it certainly doesn't hurt and once you begin to appreciate reusability or start looking at the bigger picture you absolutely need to learn it.