function zobrazSkryj_part(idecko,action){

var plus=idecko+"_plus";
var minus=idecko+"_minus";

var el=document.getElementById(idecko).style;
var el_plus=document.getElementById(plus).style; 
var el_minus=document.getElementById(minus).style;  

 if (action=='hide'){
   el.display='none';
   el_plus.display='block';
   el_minus.display='none';
 }

 if (action=='show'){
   el.display='block';
   el_plus.display='none';
   el_minus.display='block';
 }

}