function detectar_existente(obj)
{
return (typeof obj !="undefined");
}
function pop_img(img_path, popwidth, popheight, title, descripcion_img)
{
var int_windowLeft = (screen.width - popwidth) / 2;
var int_windowTop = (screen.height - popheight) / 2;
var winattributes='width='+popwidth+',height='+popheight+',resizable=yes,left='+int_windowLeft+',top='+int_windowTop;
if (typeof pop_ventana=="undefined" || pop_ventana.closed)
pop_ventana=window.open("","",winattributes);
else
{
pop_ventana.resizeTo(popwidth, popheight+30);
}
pop_ventana.document.open();
pop_ventana.document.write(''+title+'
')
pop_ventana.document.close();
pop_ventana.focus();
}
function pop_window(url, name, width, height)
{
var top = (screen.height - height) / 2;
var left = (screen.width - width) / 2;
var wnd = window.open(url, name, 'all=no,scrollbars=yes,'+'width='+width+',height='+height+',top='+top+',left='+left);
}