Repeating old data in a while statement

[The1corrupted]

[php]
<?php
session_start();
/*CHAT DISPLAY*/
/*
Data for $chatray...
0 = id
1 = who
2 = towho
3 = type
4 = message
5 = when
6 = x
7 = y
8 = z
*/
$clear=$_SESSION['clear'];
$namechat="SELECT * FROM `logs` WHERE `when`>='$clear' AND `x`='$x' AND `y`='$y' AND `z`='$z' AND `month`='$month' AND `day`='$day' AND `year`='$year'";
$querychat=mysql_query($namechat);

while ($chatray=mysql_fetch_array($querychat)) {
/***********Standard Display***********/
if ($chatray[2]==NULL) {
switch ($chatray[3]) {
//Emote
case "/":
if ($chatray[1]==$user) {
//If the user is the one that posted...
$chatdisp=$chatdisp."<b>You ".$chatray[4]."</b><br>";
} elseif ($chatray[1]!=$user) {
//elseif the user is not the one that posted...
$chatdisp=$chatdisp.ucfirst($chatray[1])." ".$chatray[4]."<br>";
}
break;
//Say
case "say":
if ($chatray[1]==$user) {
$chatdisp=$chatdisp."<b>You said, \"".$chatray[4]."\"</b><br>";
} elseif ($chatray[1]!=$user) {
$chatdisp=$chatdisp.ucfirst($chatray[1])." said, \"".$chatray[4]."\"<br>";
}
break;
//Shout
case "shout":
if ($chatray[1]==$user) {
$chatdisp=$chatdisp."<b>You shouted, \"".$chatray[4]."\"</b><br>";
} elseif ($chatray[1]!=$user) {
$chatdisp=$chatdisp.ucfirst($chatray[1])." shouted, \"".$chatray[4]."\"<br>";
}
break;
//Say OOCLY
case "sayooc":
if ($chatray[1]==$user) {
$chatdisp=$chatdisp."<b>You said OOCly, \"".$chatray[4]."\"</b><br>";
} elseif ($chatray[1]!=$user) {
$chatdisp=$chatdisp.ucfirst($chatray[1])." said OOCly, \"".$chatray[4]."\"<br>";
}
break;
//OOC Emote
case "ooc":
if ($chatray[1]==$user) {
$chatdisp=$chatdisp."<b>You OOCly ".$chatray[4]."</b><br>";
} elseif ($chatray[1]!=$user) {
$chatdisp=$chatdisp.ucfirst($chatray[1])." OOCly ".$chatray[4]."<br>";
}
break;
}
/***********Specific Display***********/
} elseif ($chatray[2]!=NULL) {
switch ($chatray[3]) {
//Say To
case "say":
if ($chatray[1]!=$user AND $chatray[2]!=$user) {
//If the user is not posting or is not directed to....
$chatdisp=$chatdisp.$chatray[1]." said to ".$chatray[2].", \"".$chatray[4]."\"<br>";
} elseif ($chatray[1]==$user AND $chatray[2]!=$user) {
//elseif the user is posting but is not directed to...
$chatdisp=$chatdisp."<b>You said to ".$chatray[2].", \"".$chatray[4]."\"</b><br>";
} elseif ($chatray[1]!=$user AND $chatray[2]==$user) {
//elseif the user is not posting but is being directed to...
$chatdisp=$chatdisp."<b>".$chatray[1]." said to you, \"".$chatray[4]."\"</b><br>";
} elseif ($chatray[1]==$user AND $chatray[2]==$user) {
//if the user posts to his or her self...
$chatdisp=$chatdisp."<b>You said to yourself, \"".$chatray[4]."\"</b><br>";
}
break;
//Tell To
case "tell":
if ($chatray[1]!=$user AND $chatray[2]!=$user) {
$chatdisp=$chatdisp;
} elseif ($chatray[1]==$user AND $chatray[2]!=$user) {
$chatdisp=$chatdisp."<b>You told ".$chatray[2].", \"".$chatray[4]."\"</b><br>";
} elseif ($chatray[1]!=$user AND $chatray[2]==$user) {
$chatdisp=$chatdisp."<b>".$chatray[1]." told you, \"".$chatray[4]."\"</b><br>";
} elseif ($chatray[1]==$user AND $chatray[2]==$user) {
$chatdisp=$chatdisp."<b>You told yourself, \"".$chatray[4]."\"</b><br>";
}
break;
//Whisper To
case "whisper":
if ($chatray[1]!=$user AND $chatray[2]!=$user) {
$chatdisp=$chatdisp.$chatray[1]." whispered something to ".$chatray[2].", but you can't hear what.<br>";
} elseif ($chatray[1]==$user AND $chatray[2]!=$user) {
$chatdisp=$chatdisp."<b>You whispered to ".$chatray[2].", \"".$chatray[4]."\"</b><br>";
} elseif ($chatray[1]!=$user AND $chatray[2]==$user) {
$chatdisp=$chatdisp."<b>".$chatray[1]." whispered to you, \"".$chatray[4]."\"</b><br>";
} elseif ($chatray[1]==$user AND $chatray[2]==$user) {
$chatdisp=$chatdisp."<b>You whispered to yourself, \"".$chatray[4]."\"</b><br>";
}
break;
//Shout To
case "shout":
if ($chatray[1]!=$user AND $chatray[2]!=$user) {
$chatdisp=$chatdisp.$chatray[1]." shouted to ".$chatray[2].", \"".$chatray[4]."\"<br>";
} elseif ($chatray[1]==$user AND $chatray[2]!=$user) {
$chatdisp=$chatdisp."<b>You shouted to ".$chatray[2].", \"".$chatray[4]."\"</b><br>";
} elseif ($chatray[1]!=$user AND $chatray[2]==$user) {
$chatdisp=$chatdisp."<b>".$chatray[1]." shouted to you, \"".$chatray[4]."\"</b><br>";
} elseif ($chatray[1]==$user AND $chatray[2]==$user) {
$chatdisp=$chatdisp."<b>You shouted to yourself, \"".$chatray[4]."\"</b><br>";
}
break;
//Say OOCLY to
case "sayooc":
if ($chatray[1]!=$user AND $chatray[2]!=$user) {
$chatdisp=$chatdisp.$chatray[1]." said OOCly to ".$chatray[2].", \"".$chatray[4]."\"<br>";
} elseif ($chatray[1]==$user AND $chatray[2]!=$user) {
$chatdisp=$chatdisp."<b>You said OOCly to ".$chatray[2].", \"".$chatray[4]."\"</b><br>";
} elseif ($chatray[1]!=$user AND $chatray[2]==$user) {
$chatdisp=$chatdisp."<b>".$chatray[1]." said OOCly to you, \"".$chatray[4]."\"</b><br>";
} elseif ($chatray[1]==$user AND $chatray[2]==$user) {
$chatdisp=$chatdisp."<b>You said OOCly to yourself, \"".$chatray[4]."\"</b><br>";
}
break;
}
}
echo $chatdisp;
}
?>
[/php]
It's a lot of code, I know but most of it repeats. Anyway, a large explanation is needed to describe what my problem is.

Alright...

Basically, I've made a chat system in PHP and it works great and everything except for one thing... The $chatdisp doesn't clear at each page refresh (pages refresh on form submit, the messages are exploded and sent to the logs table which is then read out here). What happens is message 1 (any given command) is submitted while there are no other current posts to display so the echo looks like this:

Message 1

Alright, after command 1 has been submitted and is on the $chatdisp, what happens next is then you submit Message 2 and it ends up looking like this:

Message 1
Message 1
Message 2

And after a third message submitted...

Message 1
Message 1
Message 2
Message 1
Message 2
Message 3

As you can see, this would get really confusing really fast but to sum it up, my desired effect is this:

Message 1
Message 2
Message 3

And for my final issue, I want to make $chatdisp a $_SESSION[''] variable, if possible. Any and all help is GREATLY appreciated.

[The1corrupted]

Can I get any help at all?