setting values [jquery or javascript] -

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so have input box, , when user types in want second textarea change value match of input's, on click. how can using javascript, jquery, or simpler, or php...

here's code:

this first input:

<form class="form1" action=../search.php method="post"> <input class="askinput" type="text" name="q" value="search tags , users or ask question" onclick="if(this.value == 'search tags , users or ask question') this.value='';"  onblur="if(this.value.length == 0) this.value='search tags , users or ask question';"></input>                     <input class="searchenter" type="image" name="submit" src="../images/askquestion.png"></input></form>

this textarea:

<div id="askcenter"> <img class="close" src="../images/closeask.png"></img> <h1><img src="../images/askquestiontitle.png" alt="ask question"></img></h1> <textarea></textarea> <span class="holder"><input type="text" value="add tags" onclick="if(this.value == 'add tags') this.value='';"  onblur="if(this.value.length == 0) this.value='add tags';"></input> <span class="note">&#8727; tags separated commas</span>  </span> <input class="askaway" type="image" src="../images/askaway.png" alt="ask away"/>

try here

html markup

<input type="text" id="inputfield"></textarea> <textarea id="textarea"></textarea>

jquery

$(document).ready(function(){     $('#inputfield').keyup(function() {         $('#textarea').val($(this).val());     }); });

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