function go_cool(Total,number,index,mp,mt){
 for (var i = 1; i <= number; i++) {
      document.getElementById(mp +Total+ i).src = '/images/main_nav_'+i+'b.jpg';
      document.getElementById(mt+Total+ i).style.display = 'none';
 }
  document.getElementById(mp + Total+ index).src = '/images/main_nav_'+index+'a.jpg';
  document.getElementById(mt + Total+ index).style.display = 'block';
}

function go_cools(Total,number,index,mp,mt){
 for (var i = 1; i <= number; i++) {
	  var j=i+4;
      document.getElementById(mp +Total+ j).src = '/images/main_nav_'+j+'b.jpg';
      document.getElementById(mt+Total+ j).style.display = 'none';
 }
  document.getElementById(mp + Total+ index).src = '/images/main_nav_'+index+'a.jpg';
  document.getElementById(mt + Total+ index).style.display = 'block';
}