How to include '&' to sitemapnode URL?

I am trying to do breadcrumb to my site. I took sitemap and trying to give URL to the sitemapnode and it looks like <siteMapNode url="index.aspx?cat=Customs&subcat=Acts" title="Index" description="Central Excise"> From above URL '&' is not taking and it shows error.How can we give '&' to the URL? Please help to get out of this!! ...