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Try:
<script language="JavaScript"><!-- function extract(what) { if (what.indexOf('/') > -1) answer = what.substring(what.lastIndexOf('/')+1,what.length); else answer = what.substring(what.lastIndexOf('\\')+1,what.length); alert(answer); } //--></script> <form name="myform"> <input type="file" name="myfile"> <input type="button" value="Test" onClick="extract(this.form.myfile.value)"> </form>