function preimg(){
var loadcomp = false;
	var preload = new Array();
	for(i = 0 ; i < preloadlist.length ; i++) {
		preload[i] = new Image();
		preload[i].src = preloadlist[i];
	}
	loadcomp = true;
}

function chgimg(target,filename){
	document.images[target].src = filename;
}

var preloadlist = new Array
	('/img/common/gnavi_line_on.gif',
	'/img/common/gnavi_line.gif'
	);
preimg();