que problema tengo aqui
<html>
<head>
<script language="JavaScript" type="text/javascript" >
function plataforma(){
if(document.plataforma.value==\'otro\');
alert("hola");
}
</script>
<head>
<body>
<select name="plataforma" onchange="javascript:plataforma()">
<option value="ps2-pc-rdvd">option1</option>
<option value="video">option2</option>
<option value="otro">option3</option>
</select>
<head>
<script language="JavaScript" type="text/javascript" >
function plataforma(){
if(document.plataforma.value==\'otro\');
alert("hola");
}
</script>
<head>
<body>
<select name="plataforma" onchange="javascript:plataforma()">
<option value="ps2-pc-rdvd">option1</option>
<option value="video">option2</option>
<option value="otro">option3</option>
</select>
TenÃas un par de errores: Te sobraba un ; y te faltaba un document.all.
Espero te sea útil, un saludo
<html>
<head>
<script language="JavaScript" type="text/javascript" >
function plataforma(){
if(document.all.plataforma.value=="otro")
alert("hola");
}
</script>
<head>
<body>
<select name="plataforma" onchange="javascript:plataforma()">
<option value="ps2-pc-rdvd">option1</option>
<option value="video">option2</option>
<option value="otro">option3</option>
</select>
Espero te sea útil, un saludo
<html>
<head>
<script language="JavaScript" type="text/javascript" >
function plataforma(){
if(document.all.plataforma.value=="otro")
alert("hola");
}
</script>
<head>
<body>
<select name="plataforma" onchange="javascript:plataforma()">
<option value="ps2-pc-rdvd">option1</option>
<option value="video">option2</option>
<option value="otro">option3</option>
</select>