A slightly more practical/efficient plugin based on Ivan Castellanos' answer (which was based on M4N's answer). Using || 0
will convert Nan to 0 without the testing step.
I've also provided float and int variations to suit the intended use:
jQuery.fn.cssInt = function (prop) {
return parseInt(this.css(prop), 10) || 0;
};
jQuery.fn.cssFloat = function (prop) {
return parseFloat(this.css(prop)) || 0;
};
$('#elem').cssInt('top'); // e.g. returns 123 as an int
$('#elem').cssFloat('top'); // e.g. Returns 123.45 as a float