for(i=0;i<=7;i++){
  eval('menu'+i+'_on = new Image()');
  eval('menu'+i+'_off = new Image()');
  
  eval('menu'+i+'_on.src = \"http://www.yonhapmidas.co.kr/images_04/b_menu'+i+'_on.gif\"');
  eval('menu'+i+'_off.src = \"http://www.yonhapmidas.co.kr/images_04/b_menu'+i+'_off.gif\"');
   
}

function changen(num,tog){
 eval("document.menu"+num+".src=menu"+num+"_"+tog+".src")
}

var num1=0;
function changenall(num1){
for(i=0;i<=6;i++){
num = i + 1;
 eval("document.menu"+num+".src=menu"+num+"_off.src");
 
 }
 if ( num1 > 0 )
 {
 eval("document.menu"+num1+".src=menu"+num1+"_on.src");
 }
}