Focus On Textbox Based On URL.?

I have two forms on one page and want to have the input boxes focused based on the URL.

So for example: domain.com/Default.aspx#login and domain.com/Default.aspx#register

and the javascript I have this:

if (window.location.href = '?action=login')
{
window.document.getElementById('<%=txtUserName.ClientID %>').focus();
}
else if (window.location.href = '?action=register')
{
window.document.getElementById('<%=txtRegEmail.ClientID %>').focus();
}