ej:
<script language="Javascript">
/*-- for(unKnown){
[email protected] } --*/
var today = new Date();
var expiry = new Date(today.getTime() + 28 * 24 * 60 * 60 * 1000); // 28 dias
function lee(valor)
{
document.cookie.search(RegExp("("+valor+ "=)([^;]*)(;*)","gi"))
return unescape(RegExp.$2)
}
function chek(f)
{
var name='voto'
if(lee(name)==1)
{
alert("Gracias por votar tu boto ya fue Contabilizado")
return false
}
else
{
document.cookie=name + "=1; expires=" + expiry.toGMTString();
return true
}
}
</script>
<form onsubmit="return chek(this)" action="null">
<select name="selectes">
<option value=1>valor 1
<option value=2>valor 2
</select>
<input type="submit">
</form>