function expandcontent(tabid, aobject, contenido, tabcontentcontainer){

//se activa la etiqueta del tab
var tabobj=document.getElementById(contenido)
tabobjlinks=tabobj.getElementsByTagName("A")


for (i=0; i<tabobjlinks.length; i++)
  tabobjlinks[i].className="PreActive"
  aobject.className="active"

//se activa la etiqueta del tab
var tabobj2=document.getElementById(tabcontentcontainer)
tabobjlinks2=tabobj2.getElementsByTagName("DIV")

for (i=0; i<tabobjlinks2.length; i++)
  tabobjlinks2[i].className="tabset_content"

for (i=0; i<tabobjlinks2.length; i++)
  if (tabobjlinks2[i].id=="tab"+tabid )
    tabobjlinks2[i].className="tabset_content_active"
  
  
}