function mailer() {
        var errStr = "";
        var errId = "";
        
        if ( document.getElementById("txtFirstname").value == "" ) { errStr += "\n - First name"; 
            if (errId=="") { errId = "txtFirstname";} }
        if ( document.getElementById("txtSurname").value == "" ) { errStr += "\n - Surname"; 
            if (errId=="") { errId = "txtSurname";} }
        if ( document.getElementById("txtEmail").value == "" ) { errStr += "\n - Email Address"; 
            if (errId=="") { errId = "txtEmail";} }
            
        
        if (errStr != "") {
            alert("Please complete the following field(s)\n" + errStr);
            document.getElementById(errId).focus();
            return false;
        }
    }



    function mortgage() {
        var errStr = "";
        var errId = "";
        
        if ( document.getElementById("txtFirstname").value == "" ) { errStr += "\n - First name"; 
            if (errId=="") { errId = "txtFirstname";} }
        if ( document.getElementById("txtSurname").value == "" ) { errStr += "\n - Surname"; 
            if (errId=="") { errId = "txtSurname";} }
        if ( document.getElementById("txtEmail").value == "" ) { errStr += "\n - Email Address"; 
            if (errId=="") { errId = "txtEmail";} }
            
        if ( document.getElementById("txtAmount").value == "" ) { errStr += "\n - Amount of load required"; 
            if (errId=="") { errId = "txtAmount";} }
        if ( document.getElementById("txtHouse").value == "" ) { errStr += "\n - Estimated house value"; 
            if (errId=="") { errId = "txtHouse";} }
        if ( document.getElementById("ddlRequired").value == "" ) { errStr += "\n - Loan is required for"; 
            if (errId=="") { errId = "ddlRequired";} }
        if ( document.getElementById("txtTerm").value == "" ) { errStr += "\n - Term required"; 
            if (errId=="") { errId = "txtTerm";} }
        
        
        if (errStr != "") {
            alert("Please complete the following field(s)\n" + errStr);
            document.getElementById(errId).focus();
            return false;
        }
    }