Replace choose an options with attribute label magento

Replace "choose an options"  with attribute label  magento for configurable products.

OPEN FILES:

 

Js/varien/product.js

Js/varien/configurable.js

Search for:

element.options[0] = new Option(this.config.chooseText, '');

Replace with:

element.options[0] = new Option('Select '+element.config.label, '');