function muestra(elid,url){

var e=document.createElement('IFRAME');
this.guindou=e;
e.id=elid;
e.style.position='absolute';
e.src=url;
e.style.width=530;
e.style.height=598;
e.style.left=document.body.scrollLeft +200;
e.style.top=document.body.scrollTop + 180;
document.body.appendChild(e);

}

function cierra(){

document.body.removeChild(guindou);

}