Personally I think showing the value of a slider in a text box is not the nicest thing to do. Users get confused and start typing.

As jQuery will already be on the page it is simple to a div where you want the result to be shown

<div id="valuediv" align="center"></div>

and then add a custom event to the handle moving event and pass ##value## to your event:

SetValueDiv(##value##) 

Now write a simple javascript function to show the value in the div with jQuery:

function SetValueDiv(theval)
{
$("#valuediv").text(theval);
}

and that's it.