Get css top value as number not as string?

Question

In jQuery you can get the top position relative to the parent as a number, but you can not get the css top value as a number if it was set in px.
Say I have th

Answer 1

A jQuery plugin based on M4N's answer

jQuery.fn.cssNumber = function(prop){
    var v = parseInt(this.css(prop),10);
    return isNaN(v) ? 0 : v;
};

So then you just use this method to get number values

$("#logo").cssNumber("top")