regarding idol worship and picture worship...
question is... were there pictures and paintings at that time too or it was idols only?

because idols are basically 3d pictures at the end of it...

lol and talking about worshiping stones
we should really go to hatt sahib and see whats happening there :-)

Matha tekna fotoyan ja murtiya nu iko gal aa (jida ke tusi samjhaya: 3 dimensional pic = idol).  Te Sikh falasfey vich dona da koi matlab nahi.  Tusi hatt sahib di gal karde aa. Othey Guru Nanak Dev ji de pathar paye ne, jina naal oh lokan nu "tera tera" karde unginat anaz (food) deh rahe si.  Hun oss gurdware'ch oh pathar sirf ek Guru sahib di nishani layi paye aa.  Ohna nu matha tek ke kisey nu ki miljana, kuch vi nahi.

I can't believe that in this day and age, I have to explain to people that knowledge of God (the shabad, the word) is more important than a picture or statue depicting some creative physical features.  This should be easy to grasp.