Gracias! Panino por tu respuesta...
Ya la probé y funciona muy bien.
http://www.angelinasanchez.com.ar/he...ntitled-8.html
Cuando hago la validación w3c me aparecen 3 errores
Cómo puedo corregirlos?
1/
Line 9, Column 18: character
"<" is the first character of a delimiter but occurred as data.
for (var i = 0; i
< r.length; i++) {
This message may appear in several cases:
You tried to include the "<" character in your page: you should escape it as "<"
You used an unescaped ampersand "&": this may be valid in some contexts, but it is recommended to use "&", which is always safe.
Another possibility is that you forgot to close quotes in a previous tag.
2/
Line 15, Column 6: required attribute
"type" not specified
<style
>
The attribute given above is required for an element that you've used, but you have omitted it. For instance, in most HTML and XHTML document types the "type" attribute is required on the "script" element and the "alt" attribute is required for the "img" element.
Typical values for type are type="text/css" for <style> and type="text/javascript" for <script>.
este debe ser porque falta... <style type="text/css">... no? 3/
Line 9, Column 19: XML Parsing Error: StartTag: invalid element name.
for (var i = 0; i <r.length; i++) {