Hi every one, I have problem need help that, I have a form have 1 select filed and 1 text field, I want when I choose value in option of select the text field will load/appear value in proportion to value of select, example in picture when I choose "B" in select field, the value in text filed will appear "1", so how to do it, I need example to refer, guide or demo example, Thank for read my topic.

Here is Image:

<title>Untitled Document</title>
<style type="text/css">
    <br />
    <form id="cv" action="" method="">
    	Choose Option: <select id="chedo">
        <option>--Choose Value--</option>
        <br />
        <br />
        Value: <input type="text" id="lenh" size="40"/>
        <br />
        <br />
        <input type="submit" value="SUBMIT"/>