group = models.Group.objects.get(name='group')
adminuser = forms.ModelChoiceField(queryset=group.user_set.all())<script>
function img(el) {
el.style.backgroundImage = "url(https://img3.goodfon.ru/original/1920x1080/6/a4/krasivaya-devushka-amber-heard.jpg)"
}
</script>
<body>
<div onclick='img(this)' style='width:100%;height:100%;margin-bottom: 20px; background-image: url(https://vdudvdud.ru/wa-data/public/shop/products/30/00/30/images/296/296.970.jpg);'></div>
</body>
</html>