Código:
<html>
<head>
<title> Validar Formulario </title>
<script language="Javascript1.2">
<!--
function checkForm(frm){
var email = frm.email.value;
var pattern = /^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(\.[a-zA-Z0-9_-])+/;
flag = pattern.test(email);
if(!flag) {
alert("Error en el mail");
frm.email.focus();
return false;
}
if (frm.segundo.value == ""){
alert("Error en otro campo");
frm.otrocampo.focus();
return false;
}
}
//-->
</script></head>
<body>
<form name="f1" method="post" action="" onSubmit="return checkForm(this)"">
<input name="email" type="text"><br>
<input name="segundocampo" type="text"><br>
<input name="tercercampo" type="text"><br>
<input type="submit">
</form>
</body>
</html>
<hr noshade size=1><img src="http://www.gograph.com/Images-8712/ClipArt/cat03.gif" height="50" border=0 align="absmiddle"> <font size="2" face="verdana" color="#000000">
bet[/CODE]