I have added custom option in product as selectbox. Its showing fine on frontend but in select box + sign its showing. Is there a way to remove + Sign Symobl

Select Box options are

-- Please Select --

400x600x300 + Rs1,992.00

450x600x300 + Rs2,121.00

I have change js/varien/configurable.js changed this line

var str = '';
    price = parseFloat(price);
    if(showSign){
        if(price<0){
            str+= '-';
            price = -price;
        }
        else{
            str+= '+'; **to**
            str+= ' '; 
        }
    }

But it's not working.