resizing html input fields

Is it possible using dhtml and/or style sheets to dynamically resize
an input field once a user has finished typing and moved to the next
form element? In other words, in an onBlur or onChange event handler,
reflow the page so that the width of the input field is just enough to
display the entered text. I'd like to do this without getting into
the absolute realms - percentages seem more appropriate for the
specific page and audience we are developing for.