variable as the DataBase name?

[GroundZero]

I have a problem here: php won't take a variable as the database name. can anyone help figure this one please.
Also I posted my whole code so if you see any mistake in it let me know.

//this is desidned to be used with flash to be able to do
//any interaction possible between flash and any BD
//supported by php
//Yan Brais, the_whiteknight_99@yahoo.com

<?php

switch($DBtype)
{
case &quot;odbc&quot;:

switch($DBaction)
{
case &quot;read&quot;:
if ($DBselect=&quot;all&quot
{
$DBselect=&quot;*&quot;;
}

//connect to database
$connect = odbc_connect($DBname, &quot;&quot;, &quot;&quot or die(&quot;couldn't connect.&quot;

//query the user table for room and message
$query = &quot;SELECT $DBselect FROM $DBtable&quot;;

if ($DBwhere!=none)
{
$query .= &quot;WHERE $DBwhere=$DBfield&quot;;
}

//perform the query
$result = odbc_do($connect, $query);

$NbFields=odbc_num_fields($result);
$i=1;
$j=1;

while (odbc_fetch_row($result))
{

for ($j=1;$j<=$NbField;$j++)
{
$fieldName=odbc_field_name($result,$j);
$letterRef=urlencode(odbc_result($result,$j));
print(&quot;$fieldName$i=$letterRef&&quot;
}
$i++;
}

$i=$i;
print(&quot;ok=1&&quot;
print(&quot;maxi=$i&&quot;

//disconnect from database
odbc_close($connect);

break;

case &quot;write&quot;:
//connect to database
$connect = odbc_connect(&quot;$DBname&quot;, &quot;&quot;, &quot;&quot or die(&quot;couldn't connect.&quot;

//query the user table for room and message
$query=&quot;INSERT INTO $DBtable ($DBwhere)&quot;;
$query .=&quot;VALUES ('$DBvalues')&quot;;

//perform the query
$result = odbc_do($connect, $query);

print(&quot;&pen=1&&quot;

//disconnect from database
odbc_close($connect);

break;


case &quot;update&quot;:
//connect to database
$connect = odbc_connect(&quot;$DBname&quot;, &quot;&quot;, &quot;&quot or die(&quot;couldn't connect.&quot;

$connection=odbc_do($connect);
$num=odbc_num_fields($connection);
for ($i=1;$i<=$num;$i++)
{
$fieldNameArray[$i]=odbc_field_name($connection,$i);
}

$query=&quot;UPDATE $DBtable&quot;;

for ($j=1;$j<=$num;$j++)
{
//query the user table for room and message
$query .=&quot;SET $fieldNameArray[$wichone]= $DBvalues&quot;;
}

if ($DBwhere!=none)
{
$query .= &quot;WHERE $DBwhere=$DBfield&quot;;
}
odbc_close ($connect);

$result=odbc_do($connect,$result);
print (&quot;&updated=1&&quot;

odbc_close($connect);

break;

case &quot;delete&quot;:
//connect to database
$connect = odbc_connect(&quot;$DBname&quot;, &quot;&quot;, &quot;&quot or die(&quot;couldn't connect.&quot;

$query=&quot;DELETE FROM $DBtable&quot;;

if ($DBwhere!=none)
{
$query .= &quot;WHERE $DBwhere=$DBfield&quot;;
}

$result=odbc_do($connect,$query);

print (&quot;&erased=1&&quot;

odbc_close($connect);
break;


case &quot;default&quot;:
print (&quot;&connectFailed&quot;
break;
}
break;


}
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