Validacion

[bet]

Te dejo un código de ejemplo:

<pre>
&lt;html&gt;
&lt;head&gt;
&lt;title&gt; New Document &lt;/title&gt;

&lt;script LANGUAGE=&quot;JavaScript&quot;&gt;

function Validar(form)
{
if (form.cmpo.value == &quot;&quot;) {
alert(&quot;Por favor ingrese algo&quot;);
form.cmpo.focus();
return false;
}

}

&lt;/script&gt;
&lt;/head&gt;

&lt;body bgcolor=&quot;#FFFFFF&quot;&gt;
&lt;form method=post action=&quot;&quot; onSubmit=&quot;return Validar(this);&quot;&gt;
Texto: &lt;input type=&quot;text&quot; name=&quot;cmpo&quot;&gt; &lt;input type=&quot;submit&quot; value=&quot;Enviar&quot;&gt;
&lt;/form&gt;
&lt;/body&gt;
&lt;/html&gt;
</pre>

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