I have this dropdown which have options if vehicle is new or used.

<select name="VehicleType" id="vehicleTypeDropdown" data-bind="value: VehicleType">    
    <option value="New" selected="selected">Nuevo</option>
    <option value="Used">Usado</option>
</select> `

And this input:

<input type="text" name="Mileage" data-bind="disable: VehicleType() === 'New',value:  Mileage" class="input-large"> `

If the value in the dropdown selected is New the input must be disabled, and if used the input should be enabled, but if I enter a value the observable will grab this value and if I change the dropdown value to new the observable must become zero.

data-binding knockout.js observable
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