function ventaneas(ancho,alto,nombreventana,pagina) {
	anchoPantalla=(screen.width/2)-(ancho/2)
	altoPantalla=(screen.height/2)-(alto/2)
	var win= eval('window.open(""+pagina+"",""+nombreventana+"","width="+ancho+",height="+alto+",resizable=0,toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=auto,left="+anchoPantalla+",top="+altoPantalla+",noresize")')
}
function ventanea(ancho,alto,nombreventana,pagina) {
	anchoPantalla=(screen.width/2)-(ancho/2)
	altoPantalla=(screen.height/2)-(alto/2)
	var win= eval('window.open(""+pagina+"",""+nombreventana+"","width="+ancho+",height="+alto+",resizable=0,toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=no,left="+anchoPantalla+",top="+altoPantalla+",noresize")')
}

function ventaneasc(ancho,alto,nombreventana,pagina,scroling) {
	anchoPantalla=(screen.width/2)-(ancho/2)
	altoPantalla=(screen.height/2)-(alto/2)
	var win= eval('window.open(""+pagina+"",""+nombreventana+"","width="+ancho+",height="+alto+",resizable=0,toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars="+scroling+",left="+anchoPantalla+",top="+altoPantalla+",noresize")')
}