<span>228</span>
<div>Просто Div</div>
//this - собственно, div
alert(this.previousSibling.nodeText);
this.previousSibling.previousSibling
function get_previoussibling(n)
{
x=n.previousSibling;
while (x.nodeType!=1)
{
x=x.previousSibling;
}
return x;
}