function abreVentana(url,ancho,alto)
{
var left = (screen.availWidth - ancho)/2, top = (screen.availHeight - alto)/ 2;
var imgWin = window.open(url, "", "width=" + ancho + ",height=" + alto + ",left=" + left + ",top=" + top);
}
function ipopup(img, imgTitle)
{
var width = 640, height = 480;
var left = (screen.availWidth - width)/2, top = (screen.availHeight - height)/ 2;
var imgWin = window.open("about:blank", "", "width=" + width + ",height=" + height + ",left=" + left + ",top=" + top);
if(!imgWin)
{
document.location.href=img;
}
else
{
var html = ''+imgTitle+'';
html += '';
html += '\n';
html += '\n';
html += '\n';
html += '\n';
imgWin.document.open();
imgWin.document.write(html);
imgWin.document.close();
}
}