//ヘッド画像のランダム表示
function headImg_random() {
	bgc = new Array();
	bgcURL = ["url(imges/img_head0.gif)","url(imges/img_head1.gif)","url(imges/img_head2.gif)","url(imges/img_head3.gif)"];
	n = Math.floor(Math.random()*bgcURL.length);
	document.getElementById("img_head").style.backgroundImage = bgcURL[n];
	
}

headImg_random();