iam using two different languges(arabic and english),iam uding DSlocalizer module to let the uses switch between them

,so what i want now is to apply two different skins on two different languges how can i do that?

I think there is no need to use two skins.

I will show you what I tried, it looks okay, but I cannot read the arabic texts I used so I'm not 100% sure.

I added this code to the skin's ascx file:
<script runat="server">
    Function srenderRTL() as string
        If System.Globalization.CultureInfo.CurrentUiCulture.TextInfo.IsRightToLeft then
            return "rtl"
        Else
            return ""
        End If
    End Function
</script>

And the skin looks like this:

<div dir="<%=srenderRTL%>">
    <div class="contentpane" id="ControlPanel" runat="server">
    </div>
    <div>
        <dnn:LOGO id="dnnLOGO" runat="server"></dnn:LOGO>
    </div>
    <div>
        <dnn:LANGUAGE id="dnnLANGUAGE" runat="server" showMenu="False" showLinks="True"></dnn:LANGUAGE>
    </div>
    <div>
        <dnn:NAV id="dnnNAV" runat="server" NodeLeftHTMLBreadCrumbRoot='<img alt="*" BORDER="0" src="breadcrumb.gif"/>' CSSNodeHover="main_dnnmenu_itemhover" CSSBreak="main_dnnmenu_break" CSSContainerSub="main_dnnmenu_submenu" CSSIcon="main_dnnmenu_icon" CSSNodeRoot="main_dnnmenu_rootitem" CSSNode="main_dnnmenu_item" CSSContainerRoot="main_dnnmenu_container" CSSControl="main_dnnmenu_bar" ProviderName="DNNMenuNavigationProvider"></dnn:NAV>
    </div>
    <dnn:USER id="dnnUSER" runat="server"></dnn:USER>
    <dnn:LOGIN id="dnnLOGIN" runat="server"></dnn:LOGIN>
    <div id="ContentPane" runat="server">
    </div>
</div>

Now the culture you choose will set RTL for the containing div if needed. 

Could you please leave some comment on this, we can use it for future RTL development.