function doYesNoPrompt(txt, paramcallback, params)
{
    $.prompt(txt,{
        buttons: { OK: true, abbrechen: false },
        submit: function(v,m)
        { 
            if(v)
            { 
                jQuery(paramcallback(params));
                return true;
            } 
            else
            {
                return true;
            }
        },
        overlayspeed:'fast'    
        });
}