Validating Confirm Email ID using Javascript

Hi,
In my registration form i am validating user email using javascript validation here i have conform email Id one more field i wanted to validate these also using javascript validation instead of compare validator control any Idea on this.below is my Email id Validation Javascript function.
Email ID(First)

function ValidateEmail(x)
    {
    var EmailExp=/^[a-zA-Z][\w\.-]*[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$/;
    if(x.value.match(EmailExp))
    {
        return true;
    }
    else
    {
        alert("Invalid Mail ID");
        x.value="";
        x.focus();
        return false;
    }
    }

<asp:TextBox ID="txtEmail" onchange="ValidateEmail(this)" runat="server"></asp:TextBox>

Confirm Emai ID (Second Control)
I wanted to validate this also using javascript instead of Compare validator control

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