function displayWindow(theURL,winName,width,height,features) 
{
    var window_width = width;
    var window_height = height;
    var newfeatures= features;
    var window_top = (screen.height-window_height)/2;
    var window_left = (screen.width-window_width)/2;
    newWindow=window.open(''+ theURL + '',''+ winName + '','width=' + window_width + ',height=' + window_height + ',top=' + window_top + ',left=' + window_left + ',features=' + newfeatures + '');
    newWindow.focus();
}
function obre_index(ruta)
{
	displayWindow(ruta,'','500','400','status=no,menubar=no,scrollbars=no,resizable=no');
}
function obre_finestra(ruta1)
{
	displayWindow(ruta1,'','760','525','status=no,menubar=no,scrollbars=no,resizable=no');
}