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Another TextField jump

<html><HEAD><TITLE>Jump Fields Demo</TITLE> <script language=javascript> <!-- function checklength(nextfield,chars,currfield) {   x= document.phone[currfield].value.length   if (x == chars) {     eval('document.phone.' + nextfield + '.focus();');   } } //--> </SCRIPT> </HEAD> <BODY> <FORM name=phone> ( <INPUT value="" name=areacode maxlength="3" size="3" onkeyup="checklength('prefix',3,this.name)"> )&nbsp; <INPUT value="" name=prefix maxlength="3" size="3" onkeyup="checklength('suffix',3,this.name)"> - <INPUT value="" name=suffix maxlength="4" size="4"> </FORM></BODY></HTML>