if(document.images){
 var onimg=new Array("images/menu1_1.gif","images/menu2_1.gif","images/menu3_1.gif","images/menu4_1.gif")
 var offimg=new Array("images/menu1_2.gif","images/menu2_2.gif","images/menu3_2.gif","images/menu4_2.gif")
 var onsel=new Array();
 var offsel=new Array();
 for (i=0; i<onimg.length; i++){
 onsel[i]=new Image();
 offsel[i]=new Image();
 onsel[i].src=onimg[i];
 offsel[i].src=offimg[i];
}
}
function onSelect(n){
 if(document.images){
     document.images["imge" + n].src=onsel[n].src;
}
}
function offSelect(n){
 if(document.images){
     document.images["imge" + n].src=offsel[n].src;
}
}