Knockoutjs Custom Binding style child

I have a custom binding.

<div data-bind="autocomplete : { inputStyle : { marginRight : marginR }}"></div>

in my init function I do this. I add a inputbox that I need to be styled.

$element.append("<input type='text' data-bind='style='" + value.inputStyle + "' />");

I know this wont work, but please can somebody help me do it right.

Here is the custom binding doing what you requested:

function toStyleStr (obj) {
    var result = "";
    $.each(obj, function (k,v) {
        result += k.toString() + ": " + ko.utils.unwrapObservable(v).toString() + ";"; 
    });    
    return result;               
}

ko.bindingHandlers.autocomplete = {
    init: function (element, valueAccessor) {
        var value = ko.utils.unwrapObservable(valueAccessor()),
            $element = $(element);
        $element.append("<input type='text' style='" + toStyleStr(value.inputStyle) + "' />");     
    }            
};

var model = {
    marginR: ko.observable("10px")
};
ko.applyBindings(model);

Here is a working fiddle: http://jsfiddle.net/RYnbR/2/