function showDisplay(idName){   
   
 var displayCount=0;   
 var showID="content0";   
   
 if(typeof arguments[1] == "number") var displayCount=arguments[1];   
 if(typeof arguments[2] == "string") var showID=arguments[2];   
   
 if (displayCount>0){   
 for (var i=1;i<=displayCount;i++) document.getElementById(showID+i).style.display="none";   
 }   
   
 var result=document.getElementById(idName).style.display;   
   
 if (result=="none") document.getElementById(idName).style.display="block";   
 else document.getElementById(idName).style.display="none";   
   
 return ;   
 }