Haber, tengo esto pero no me funciona,por favor exarme una mano
Código:
<html>
<head>
<script language="JavaScript">
function todos(valor) {
for (var i = 0, total = document.forms[0].elements; i < total.length; i ++)
total[i].checked = valor;
}
</script>
<head>
<body>
<form>
<input type="checkbox" name="check1" value="ch1" />
<input type="checkbox" name="check1" value="ch2" />
<input type="checkbox" name="check1" value="ch3" />
<input type="checkbox" name="check2" value="ch4" />
<input type="checkbox" name="check2" value="ch5" />
<input type="checkbox" name="check2" value="ch6" />
<input type="checkbox" name="todos" value="todos" onclick="todos(this.checked)" />
</form>
<body>
<html>