mshtml: Added put_backgroundImage implementation.

dlls/mshtml/htmlstyle.c

@@ -44,6 +44,8 @@ typedef struct {
 
 static const WCHAR attrBackgroundColor[] =
     {'b','a','c','k','g','r','o','u','n','d','-','c','o','l','o','r',0};
+static const WCHAR attrBackgroundImage[] =
+    {'b','a','c','k','g','r','o','u','n','d','-','i','m','a','g','e',0};
 static const WCHAR attrBorderLeft[] =
     {'b','o','r','d','e','r','-','l','e','f','t',0};
 static const WCHAR attrColor[] =
@@ -451,8 +453,10 @@ static HRESULT WINAPI HTMLStyle_get_backgroundColor(IHTMLStyle *iface, VARIANT *
 static HRESULT WINAPI HTMLStyle_put_backgroundImage(IHTMLStyle *iface, BSTR v)
 {
     HTMLStyle *This = HTMLSTYLE_THIS(iface);
-    FIXME("(%p)->(%s)\n", This, debugstr_w(v));
-    return E_NOTIMPL;
+
+    TRACE("(%p)->(%s)\n", This, debugstr_w(v));
+
+    return set_style_attr(This, attrBackgroundImage, v, 0);
 }
 
 static HRESULT WINAPI HTMLStyle_get_backgroundImage(IHTMLStyle *iface, BSTR *p)