Culture sensitive ParseFloat Function in JavaScript?

Question

Do anyone have suggestion for writing culture sensitive ParseFloat Function in JavaScript, So that when I have a string 100,000.22 in US culture format the parse float function returns 100000.22 whereas if I enter 100.000,22 in Swedish Culture it returns 100000.22 in float?

Answer 1

I've improved mwilcox' function to handle values withous separators.

function parseFloatOpts (str) {

     if(typeof str === "number"){
         return str;
     }

     var ar = str.split(/\.|,/);  

     var value = '';
     for (var i in ar) {
         if (i>0 && i==ar.length-1) {
             value += ".";
         }
         value +=ar[i];
     }
     return Number(value);
}