function pantallaCompleta(pagina) {
window.open(pagina, '', 'fullscreen=yes, scrollbars=yes, toolbar=no, location=no,directories=no,resizable=no,top=0,left=0');
}
function exit()
{ 
window.open('http://www.afotosporno.com/masgaleriasporno.php','salida','menubar=yes,scrollbars=yes,toolbar=yes,location=yes,directories=yes,resizable=yes,top=0,left=0');self.focus();  
}
<!--
var thumb = null;
function showThumbnail(which,e)
{
thumb = document.getElementById('thumb');
if( thumb && thumb.style.visibility == 'hidden' )
{
thumb.style.left       = e.pageX ? pageXOffset + e.clientX + 20 : document.body.scrollLeft + e.x + 20;
thumb.style.top        = e.pageY ? pageYOffset + e.clientY : document.body.scrollTop  + e.y;
thumb.style.visibility = 'visible';
thumb.innerHTML        = '<img src="' + which + '">';
}
}
function closeThumbnail()
{
if( thumb )
thumb.style.visibility = 'hidden';
}
function MM_jumpMenu(targ,selObj,restore){ //v3.0
window.open (eval("url='"+selObj.options[selObj.selectedIndex].value+"'"));
if (restore) selObj.selectedIndex=0;
}
//-->