Fejl i Update sætning

Hvad er der galt med denne sætning :

Sql = "Update Medlem Set "
Sql = Sql & "Name='"&ChkString(Name)&"', "
Sql = Sql & "Address='"&ChkString(Address)&"', "
Sql = Sql & "Zip='"&ChkString(Zip)&"', "
Sql = Sql & "City='"&ChkString(City)&"', "
Sql = Sql & "Phone='"&ChkString(Phone)&"', "
Sql = Sql & "Email='"&ChkString(Email)&"', "
Sql = Sql & "Website='"&ChkString(Website)&"', "
Sql = Sql & "Icq='"&ChkString(Icq)&"', "
Sql = Sql & "UserName='"&ChkString(UserName)&"', "
Sql = Sql & "Password='"&ChkString(Password)&"', "
Sql = Sql & "Text='"&ChkString(nText)&"'"
Sql = Sql & " Where Id="&Request.QueryString("Id")&""

Hvis jeg udskriver den serd et fint ud det hele, men får stadig fejl der heder :

Syntax error in UPDATE statement.

/WebSam