function abreventana(pagina){
window.open(pagina,"","height=500,width=750,top=7,left=15,menubar=yes,scrollbars=yes");
}

function abreventanaHW(){
args = abreventanaHW.arguments;
window.open(args[0],"","height="+args[1]+",width="+args[2]+",top=5,left=5,menubar=yes,scrollbars=yes");
}