Verify MSSQL User/Password/Database Combination

I am currently writing a little gadget where users can create, delete, alter... tables in a database. Some kind of MyAspAdmin... Everything works fine as long as I specify the MSSQL-Login-Infos database, user and password.

But if I want to make it possible to switch from one database to another, here comes the problem: The user has to choose a database that he wants to work in, and type in user and password.

I need the (probably very easy) solution, how i can check if this user/password/chosen_database combination is correct. Code:

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Verify New Password Meets Format Conditions

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I need to require that new passwords be at least 8 characters and contain at least one character from upper case, lower case, number and special characters. I've searched but haven't found anything that looks like it would work - only scripts to prohibit certain characters.

function mt_valForm(val)
{
var passed = true;
var mt_error = '';
if (val.txtusername.value == ""){passed=false; mt_error+="Please provide a user name
"}

if (val.txtpassword.value == ""){passed=false; mt_error+="Please provide a password
"}

if (val.txtemail.value.indexOf("@") == -1 || val.txtemail.value.indexOf(".") == -1){passed=false;
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"}

if (mt_error!= ''){alert ("There were errors - please correct these:

" + mt_error)}
return passed;

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Here's an example of my table:

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/zbgamers/login.asp, line 13

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