Muchas gracias a todos!!
Gracias por responder a mi pregunta.
Aunque el Flash me parecia una buena opcion, al final he encontrado un codigo que me lo hacia utomaticamente. hos lo dejo aquí por si alguien quiere usarlo:
<div id="splashcontainer" style="position:absolute;width:350px;"></div>
<layer id="splashcontainerns" width=450></layer>
<script>
/*
Dynamic Splash Screen effect- © Dynamic Drive ([url]www.dynamicdrive.com[/url])
For full source code, installation instructions, 100's more DHTML scripts, and Terms Of Use,
Visit [url]http://dynamicdrive.com[/url]
*/
//Specify the paths of the images to be used in the splash screen, if any.
//If none, empty out array (ie: preloadimages=new Array())
var preloadimages=new Array("ejemplos/7x360.jpg")
//configure delay in miliseconds between each message (default: 2 seconds)
var intervals=2000
//configure destination URL
var targetdestination="http://www.gamarod.com.ar/articulos/"
//configure messages to be displayed
//If message contains apostrophe('), backslash them (ie: "I\'m fine")
var splashmessage=new Array()
var openingtags='<font face="Arial" size="4">'
splashmessage[0]='Aquí lo que quieras'
splashmessage[1]='y puedes poner más'
splashmessage[2]='texto...texto...'
splashmessage[3]='también imágenes...[img]images/mailto.gif[/img]'
splashmessage[4]='Te invito a pasar y disfrutar del site.'
splashmessage[5]='Por favor espere ...'
var closingtags='</font>'
//Do not edit below this line (besides HTML code at the very bottom)
var i=0
var ns4=document.layers?1:0
var ie4=document.all?1:0
var ns6=document.getElementById&&!document.all?1:0
var theimages=new Array()
//preload images
if (document.images){
for (p=0;p<preloadimages.length;p++){
theimages[p]=new Image()
theimages[p].src=preloadimages[p]
}
}
function displaysplash(){
if (i<splashmessage.length){
sc_cross.style.visibility="hidden"
sc_cross.innerHTML='[b]<center>'+openingtags+splashmessage[i]+closingtags+'</center>[/b]'
sc_cross.style.left=ns6?parseInt(window.pageXOffset)+parseInt(window.innerWidth)/2-parseInt(sc_cross.style.width)/2 : document.body.scrollLeft+document.body.clientWidth/2-parseInt(sc_cross.style.width)/2
sc_cross.style.top=ns6?parseInt(window.pageYOffset)+parseInt(window.innerHeight)/2-sc_cross.offsetHeight/2 : document.body.scrollTop+document.body.clientHeight/2-sc_cross.offsetHeight/2
sc_cross.style.visibility="visible"
i++
}
else{
window.location=targetdestination
return
}
setTimeout("displaysplash()",intervals)
}
function displaysplash_ns(){
if (i<splashmessage.length){
sc_ns.visibility="hide"
sc_ns.document.write('[b]'+openingtags+splashmessage[i]+closingtags+'[/b]')
sc_ns.document.close()
sc_ns.left=pageXOffset+window.innerWidth/2-sc_ns.document.width/2
sc_ns.top=pageYOffset+window.innerHeight/2-sc_ns.document.height/2
sc_ns.visibility="show"
i++
}
else{
window.location=targetdestination
return
}
setTimeout("displaysplash_ns()",intervals)
}
function positionsplashcontainer(){
if (ie4||ns6){
sc_cross=ns6?document.getElementById("splashcontainer"):document.all.splashcontainer
displaysplash()
}
else if (ns4){
sc_ns=document.splashcontainerns
sc_ns.visibility="show"
displaysplash_ns()
}
else
window.location=targetdestination
}
window.onload=positionsplashcontainer
</script>
<div align="right">
<table border="0" width="200" height="100%" cellspacing="0" cellpadding="0">
<td width="100%" valign="bottom" align="right">
[ [url="http://www.gamarod.com.ar/javascript/"]<font color="#FFFFFF">Saltar Intro</font>[/url] ]
</td>
</table>
</div>
Esta tal cual me lo dieron en la web yomaster.com pero es facil de ver lo que hay que modificar:
:arrow: El texto (por supuesto)
:arrow: La pagina a la que redirecciona
:arrow: Y la pagina a la que se va pulsando el boton saltar intro (supongo que sera la misma)
que lo disfruteis!!