var xpos=0;
var Id=0;
function mueve(){
 if(!Id){
 mueve_banner();
xpos=400;
}
 }

function mueve_banner(){
xpos--;
if(document.layers){
document.txt_promocion.left=xpos;
}
if(document.all){
document.all.txt_promocion.style.left=xpos;
}
if(!document.all && document.getElementById){
document.getElementById("txt_promocion").style.left=xpos+"px";
}
if (xpos<=-800){
window.clearTimeout(Id);Id=0;
xpos=400;
Id = window.setTimeout("mueve_banner();",0);
}else{
Id = window.setTimeout("mueve_banner();",0);
}
}