function thinkover(thisobj,num)
{if(thisobj.classname=="active")
return;
var tabobj=thisobj.parentnode.id;
var tablist=document.getelementbyid(tabobj).getelementsbytagname("li");
for(i=0;i<tablist.length;i++)
{if (i==num){thisobj.classname="active";document.getelementbyid(tabobj+"c"+i).style.display="block"}
else{tablist[i].classname="normal";document.getelementbyid(tabobj+"c"+i).style.display="none"}}};