function random_img1(num1,num2) {
	if((num1 - num2) > 0) {
	var big = num1
	var small = num2
	} else {
	var big = num2
	var small = num1
	}
	var range = big - small + 1
	var number = Math.floor(Math.random()*range) + small
	return(number)
}
function random_img2() {
	var img_src = "img" + random_img1(1,7)
	document.write("<a href='contents/works/index.html' title='VOICE.スタイル。WORKSへ。' id='"+img_src+"'>VOICE. WORKS</a>")
}