function dodo(dastringola)
{
        var i,dodo,len,dachar,diff,complement;
        dodo = "";
        len = dastringola.length;

        i = len-1;
        while (i >= 0)
        {
                dachar = dastringola.charCodeAt(i) & 0xff;
                if (dachar == 95)
                {
                        dodo += String.fromCharCode(95);
                }
                else if (dachar >= 97)
                {
                        diff = dachar-97;
                        complement = 122-diff;
                        dodo += String.fromCharCode(complement);
                }
                else
                {
                        dodo += String.fromCharCode(dachar - 5);
                }
                i--;
        }
        document.write(dodo);
}