function menuchange(flag,position){

//main menu
icon=new Array(16)
icon["01"]=new Image();icon["01"].src="img/menu01.gif";
icon["02"]=new Image();icon["02"].src="img/menu01_on.gif";
icon["03"]=new Image();icon["03"].src="img/menu02.gif";
icon["04"]=new Image();icon["04"].src="img/menu02_on.gif";
icon["05"]=new Image();icon["05"].src="img/menu03.gif";
icon["06"]=new Image();icon["06"].src="img/menu03_on.gif";
icon["07"]=new Image();icon["07"].src="img/menu04.gif";
icon["08"]=new Image();icon["08"].src="img/menu04_on.gif";
icon["09"]=new Image();icon["09"].src="img/menu05.gif";
icon["10"]=new Image();icon["10"].src="img/menu05_on.gif";
icon["11"]=new Image();icon["11"].src="img/menu06.gif";
icon["12"]=new Image();icon["12"].src="img/menu06_on.gif";
icon["13"]=new Image();icon["13"].src="img/menu07.gif";
icon["14"]=new Image();icon["14"].src="img/menu07_on.gif";
icon["15"]=new Image();icon["15"].src="img/menu08.gif";
icon["16"]=new Image();icon["16"].src="img/menu08_on.gif";


document.images[position].src=icon[flag].src}