function menuchange(flag,position){

icon=new Array(10)
icon["01"]=new Image();icon["01"].src="img/topmain_03.gif";
icon["02"]=new Image();icon["02"].src="img/topmain2_03.gif";
icon["03"]=new Image();icon["03"].src="img/topmain_05.gif";
icon["04"]=new Image();icon["04"].src="img/topmain2_05.gif";
icon["05"]=new Image();icon["05"].src="img/topmain_07.gif";
icon["06"]=new Image();icon["06"].src="img/topmain2_07.gif";
icon["07"]=new Image();icon["07"].src="img/topmain_09.gif";
icon["08"]=new Image();icon["08"].src="img/topmain2_09.gif";
icon["09"]=new Image();icon["09"].src="img/topmain_11.gif";
icon["10"]=new Image();icon["10"].src="img/topmain2_11.gif";

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