Código:
Gracias! <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html class="no-js" lang="en">
<head>
<meta name="description" content="" />
<script src='http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js' type='text/javascript'></script>
</head>
<body>
<select name="seqselect" id ="seqselect" />
<option selected> Choose an option </option>
<optgroup id ="Ejemplos" style="color: #E9122F;" label="Ejemplos">
<option value="Ejemplo1">Ejemplo1</option>
</optgroup>
<optgroup id ="Pruebas" style="color: #0B33E6;" Label="Pruebas">
<option value="Pruebas1">Pruebas1</option>
</optgroup>
</select>
<script>
$("#seqselect").change(function(){
var selected = $("option:selected", this);
var colour = document.getElementById(selected.parent()[0].id).style.color;
if (document.getElementById('sequence').innerHTML == ""){
document.getElementById('sequence').innerHTML = this.value;
document.getElementById('sequence').style.color = colour;
}
else
{
document.getElementById('sequence').innerHTML = document.getElementById('sequence').innerHTML+" "+this.value;
document.getElementById('sequence').style.color = colour;
}
});
</script>
<textarea readonly style="resize:none; width:97%;" id="sequence" name="seq" rows="2" ></textarea><p>
</body>
</html>


