function showFocus(num)
{
 for(var id = 1;id<=8;id++)
 {
  var fpid="focusPic"+id;
  var fcid="focusContent"+id;
  var fnid="focusnav"+id;
  if(id==num){
  	try{document.getElementById(fpid).style.display="block"}catch(e){};
	try{document.getElementById(fcid).style.display="block"}catch(e){};
	try{document.getElementById(fnid).className="active"}catch(e){};
  }else{
	try{document.getElementById(fpid).style.display="none"}catch(e){};
	try{document.getElementById(fcid).style.display="none"}catch(e){};
	try{document.getElementById(fnid).className="showFocus"}catch(e){};
  }
 }  
}