CSS Overflow-x not working

If your div doen't scroll it is quite surely because you haven't use a magic word in your CSS

#divscroll{
	width: 500px;
	overflow-x: auto;
	white-space: nowrap;
}

without white-space: nowrap the text wraps so the div doesn't need to scroll. If you block the wrap (due to the white space) the div is surely going to scroll.