var posLeft = (screen.width - 625) / 2;
var posTop = (screen.height - 435) / 2;

var size = 'height=435,width=625,top=' + posTop + ',left=' + posLeft + ',resizable=1,toolbar=0,menubar=0';

function openOffLiveHelp() {
	LiveHelpWindow = window.open('http://www.mihosting.mx/livehelp/offline.php?LANGUAGE=es', 'LiveHelpmihostingcommx', size);
	if (LiveHelpWindow) { LiveHelpWindow.opener = self; }
}