Combining retrieved values with javascript and jquery

Possible Duplicate:

How do I Convert a String into an Integer in JavaScript?

I have a select element that contains options for products. What I want to achieve is when they pick an option the price on the page automatically adjusts. I have figured out how to retrieve those values but when I combine them it just puts two numbers together instead of actually adding them.

For example instead of outputting 60 when I have 50 + 10 it outputs 5010.

My code:

$(\'.product_options\').change(function(){
var base_price = $(\'#base_price\').html();
var add_price = $(this).find(\"option:selected\").data(\'price\');

var new_price = base_price+add_price;

console.log(new_price);

$(\'.current_price\').html(base_price+add_price);

});

Is there a way I can convert them both to integers so the operation actually goes through?

Thanks in advance!

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