function secBoard(n)
{var menu_h=document.getElementById("menu_h").getElementsByTagName("li");
 var main_h=document.getElementById("main_h").getElementsByTagName("li");
for(i=0;i<menu_h.length;i++)
menu_h[i].className="sec1";
menu_h[n].className="sec2";
for(i=0;i<main_h.length;i++)
main_h[i].style.display="none";
main_h[n].style.display="block";
}
function secBoard_lb(n)
{var menu_h_lb=document.getElementById("menu_h_lb").getElementsByTagName("li");
 var main_h_lb=document.getElementById("main_h_lb").getElementsByTagName("li");
for(i=0;i<menu_h_lb.length;i++)
menu_h_lb[i].className="sec1";
menu_h_lb[n].className="sec2";
for(i=0;i<main_h_lb.length;i++)
main_h_lb[i].style.display="none";
main_h_lb[n].style.display="block";
}
function change(){ 
       var con1=document.getElementById("main_sj_left");    
       var con2=document.getElementById("main_sj_right");      
       if (con1.offsetHeight < con2.offsetHeight){           
              con1.style.height=con2.offsetHeight+"px";    
       }
       else{                                                           
              con2.style.height=con1.offsetHeight+"px";    
       }
}