[SOLVED] Checking a PHP variable in a JAVA scipt

[ifis]

I'm trying to check to see if a username in my databased is used before a form is submitted.  I have created a simple JAVA scipt to check to see if a field in the form is filled out.  I have also created a seperate php scipt to check if the username is already used.  I would like to combine these two so a message is sent if the username is used before form submition to the server.  Any suggestions?

 

JAVA code:

<script type='text/javascript'>
function validate_required(field,alerttxt)
{
with (field)
{
if (value==null||value=='')
  {alert(alerttxt);return false}
else {return true}
}
}function validate_form(thisform)
{
with (thisform)
{
if (validate_required(actype9,'actype9 must be filled out!')==false)
  {email.focus();return false}
}
}
</script>


<form method='POST' action='updateprofile.php' onsubmit='return validate_form(this)'>

PHP code:

//check is username already exists
// Connect to server and select databse.
mysql_connect("$host", "$username", "$password")or die("cannot connect"); 
mysql_select_db("$db_name")or die("cannot select DB");
$sql="SELECT loginName FROM $tbl_name WHERE loginName='$myusername'";
$result=mysql_query($sql);
// Mysql_num_row is counting table row
$count=mysql_num_rows($result);
// If result matched $myusername table row must be 1 row
if($count==1){
echo "$myusername is already taken.  Please choose another username.";
}
else {

Thanks for help!

[sKunKbad]

have javascript make a cookie from the username, and php can check to see if the cookie exists. That is the only way I know to get a variable between the two languages.