var nombre_imagen  = '';
function abrirVentana(url,nombreImagen,nombreVentana,width,height)
{
	nombre_imagen = nombreImagen;
//	var window_top = (screen.height-height)/2;
//	var window_left = (screen.width-width)/2;
	var window_top = 0;
	var window_left = 0;
	var window_width = parseInt(width)+20;
	var window_height = parseInt(height) +40;
	ventana = window.open(url,nombreVentana,'width='+window_width+',height='+window_height+',top='+window_top+',left='+window_left+',toolbar=no,location=no,status=no,menubar=no,scrollbars=no,resizable=no,titlebar=no');
	ventana.focus();
}