How to show selected items in multiple select Box

This is my mutiple select drop down box in edit page. This shows selected items in multiple select in my edit page.but the problem is there is a warning msg Warning: Invalid argument supplied for foreach() in F:\xampplite\htdocs\chem1\admin\edituser.php on line 292 can u see wat is wrong here

[php]$emp_id = $_GET[‘emp_id’];
$result = mysql_query(“SELECT * FROM members WHERE emp_id=$emp_id”)
or die(mysql_error());
$row = mysql_fetch_array($result);
if($row)
{
$login = $row[‘login’];
$email = $row[‘email’];
$type = $row[‘type’];
}
$result1 = mysql_query(“Select *
from members
JOIN lab_employee on members.emp_id = lab_employee.emp_id
JOIN lab on lab_employee.lab_id = lab.lab_id
where members.emp_id=$emp_id”)
or die(mysql_error());

$query=“SELECT * FROM lab”;
$dropdown = “”;
//$dropdown .= "Select lab to assign ";
$result2 = mysql_query ($query);
while($row2 = mysql_fetch_array($result2))
{

$dropdown .= “\r\n<option value=’{$row2[‘lab_id’]}’”;
foreach(mysql_fetch_array($result1) as $row1) // line 292
{
if(($row1[‘lab_id’])==($row2[‘lab_id’]))
{
$dropdown .=" selected=‘selected’";
}
}
$dropdown .= “>{$row2[‘l_name’]}”;
}
$dropdown .= “\r\n”;
echo $dropdown;
[/php]

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