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how to trim white spaces in a string ? pls help

hi,
i am new to the world of javascript. pls tell me how to trim extra spaces like
” myname ”
i searched for a trim(), no use!!

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JavaScript

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@CharlesJun 27.2005 — <script type="text/javascript">
<!--
String.prototype.trim = function () {return this.replace(/(^s+)|(s+$)/g, '')}

document.write ('<p>|', ' myname '.trim(), '|</p>');
// -->
</script>
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