function preL(){
var bc;
n = 1;
while (n < 10) {
bc = new Image(); bc.src = "img/mn" + n + "on.gif";
         n++;
     }
}


function on(n){
if(n<10 || n>20){
        document.images["btn"+n].src = "images/mn" + n + "on.gif";
	} else if (10<n<20){
        document.images["btn"+n].src = "../common/mn" + n + "on.gif";
     } 
}


function off(n){
if(n<10 || n>20){
        document.images["btn"+n].src = "images/mn" + n + ".gif";
	} else if (10<n<20){
        document.images["btn"+n].src = "../common/mn" + n + ".gif";
     } 
}

openwin = new Array() ;
function owd(jsn, url, ww, hh) {
own = jsn ;
openwin[own]=window.open(url, own , "width="+ww+",height="+hh+",resizable=no,scrollbars=yes,left=500,top=30") ;
        }