function abrirVentana(pag,i,j,tit){
	x = (screen.width/2)-(i/2);
	y = (screen.height/2)-(j/2);
	window.open(pag,tit,'toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=1,width='+i+',height='+j+',left='+x+',top='+y);
}

function abrirVentanaFija(pag,i,j,tit){
	x = (screen.width/2)-(i/2);
	y = (screen.height/2)-(j/2);
	window.open(pag,tit,'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width='+i+',height='+j+',left='+x+',top='+y);
}