numfuncs.js

var Num = function(value, options) {

 options = options || ["num"];

 for(var o in options) {

    if(options[o] == "trunc") { // truncate towards zero
        value=~~value;
    }
    if(options[o] == "num") { // string or boolean to number
        value=+value;
    }
    if(options[o] == "int") { // string to number or truncate toward zero
        value=value|0;
    }
    if(options[o] == "odd") { // is the number odd?
        value=!!(value & 1);
    }
    if(options[o] == "negative" || o == "neg") {
        value=-value;
    }
 }

 return value;
};

Num("200.23");

this explains what i'm talking about a little better...