Conditional Statement on xml file

[EDN Admin]

i have an XML file like this..
<?xml version="1.0" encoding="utf-8" ?>
<CompanyName Title="Home" Description="Home page" Template="Company Site with Workflow" URL="" isPrimaryNavigation="True" isSiteMap="False" isExternalLink="False" isPage="0 <br/>
<Site Title="Brands1" Description="" Template="" URL="brands" isPrimaryNavigation="True" isSiteMap="True" isExternalLink="False" isPage="0 <br/>
<Site Title="Product1" Description="" Template="" URL="Product1.aspx" isPrimaryNavigation="True" isSiteMap="True" isExternalLink="False" isPage="1" /><br/>
<Site Title="Product2" Description="" Template="" URL="Product2.aspx" isPrimaryNavigation="True" isSiteMap="True" isExternalLink="False" isPage="1" /><br/>
<Site Title="Product3" Description="" Template="" URL=" http://www.product3.com/products http://www.Product3.com/products " isPrimaryNavigation="True" isSiteMap="True" isExternalLink="True" isPage="1" /><br/>
</Site>
<Site Title="Brands2" Description="" Template="" URL="brands" isPrimaryNavigation="True" isSiteMap="True" isExternalLink="False" isPage="0 <br/>
<Site Title="Product1" Description="" Template="" URL="Product1.aspx" isPrimaryNavigation="True" isSiteMap="True" isExternalLink="False" isPage="1" /><br/>
<Site Title="Product2" Description="" Template="" URL="Product2.aspx" isPrimaryNavigation="True" isSiteMap="True" isExternalLink="False" isPage="1" /><br/>
<Site Title="Product3" Description="" Template="" URL=" http://www.product3.com/products http://www.Product3.com/products " isPrimaryNavigation="True" isSiteMap="True" isExternalLink="True" isPage="1" /><br/>
</Site>

</CompanyName>

how can i add conditional statement that will analyze.. if Cookie.Value = "B1" then only Brands1 Title and its sub elements will be used and all Brands2 Site including its sub elements will be disregarded or hidden. This is an XML that displays primary navigation
options. I want the cookie value to determine which links/sites will be displayed. Please advise if you need more clarifications on this topic. Thanks
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