Prova questo
codice:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Untitled</title>
<script language="JavaScript" type="text/javascript">
<!--
var myArr = new Array();
function assegnaArray(aForm) {
a = 0;
var tmpArr = new Array();
nbFigli = aForm.children.length;
for (i=0;i<nbFigli;i++) {
curFiglio = aForm.children(i);
if (curFiglio.tagName == 'INPUT' && curFiglio.type == 'text') {
tmpArr[a++] = curFiglio.value;
} // if (curFiglio.tagName == 'INPUT' && curFiglio.type == 'text')
} // for (i=0;i<nbFigli;i++)
return tmpArr;
} // function assegnaArray(aForm)
function ass() {
myArr = assegnaArray(document.getElementById('myform'));
alert(myArr);
} // function ass()
//-->
</script>
</head>
<body>
<form action="" method="post" id="myform">
A<input type="text" id="c[0]">
B<input type="text" id="c[1]">
C<input type="text" id="c[2]">
D<input type="text" id="c[3]">
E<input type="text" id="c[4]">
</form>
<input type="button" value="Assegna" onclick="ass()">
</body>
</html>