function isMatch(str1,str2){ 
 var index = str1.indexOf(str2); 
 if(index==-1) return false; 
 return true; 
} 
function ResumeError(){ 
 return true; 
} 
window.onerror = ResumeError; 
function doClick(o){ 
 o.className="nav_current"; 
 var j; 
 var id; 
 var e; 
 for(var i=1;i<=8;i++){ 
  id ="nav"+i; 
  j = document.getElementById(id); 
  e = document.getElementById("sub"+i); 
  if(id != o.id){ 
   j.className="nav_link"; 
   e.style.display = "none"; 
  }else{ 
   e.style.display = "block"; 
  } 
 } 
}