function over(_param){
eval("document.images." + _param + ".src='../esp/img/"+_param+"_on.gif'");
}

function out(_param){
eval("document.images." + _param + ".src='../esp/img/"+_param+"_off.gif'");
}

function lanzaAnimacion(_param){
  Oberwindow(_param,'nuevo','width=365,height=260',365,260);
}