How to inset a button in the text field (image attached)

How to inset a button in the text field (image attached)

pIn my form I have a disabled text field which its value is a number e.g
price, So I would like to add the submit button inside or over this field,
to make something like this image:/p pimg
src=http://i.stack.imgur.com/kt0iF.jpg alt=enter image description here/p
precode lt;input name= type=text maxlength=50 value=£0.00 id= disabledgt;
lt;button value=submitgt;Submitlt;/buttongt; /code/pre