function popup(f,l,a) {var i = (screen.width - l)/2;var j = (screen.height - a)/2;  window.open(f,'janelapopup','height='+a+',width='+l+',top='+j+',left='+i); }function abreJanela(f,l,a) {var i = (screen.width - l)/2;var j = (screen.height - a)/2;window.open(f,'janelapopup','height='+a+',resizable=yes,scrollbars=yes,width='+l+',top='+j+',left='+i); }