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"; 
  } 
} 
}