website problem *read inside*

I need help about running my website, here's the problem.

Fatal error: Call to undefined function mssql_connect() in C:\xampp\htdocs\Website\inc\votebox.inc.php on line 213

And here's the votebox.inc.php
Code:
<?php  
$ip = $_SERVER['REMOTE_ADDR'];  
$time = date("l dS of F Y h:i:s A");  
$script = $_SERVER[PATH_TRANSLATED];  
$fp = fopen ("[WEB]SQL_Injection.txt", "a+");  
$sql_inject_1 = array(";","'","%",'"'); #Whoth need replace  
$sql_inject_2 = array("", "","","""); #To wont replace  
$GET_KEY = array_keys($_GET); #array keys from $_GET  
$POST_KEY = array_keys($_POST); #array keys from $_POST  
$COOKIE_KEY = array_keys($_COOKIE); #array keys from $_COOKIE  
/*begin clear $_GET */  
for($i=0;$i<count($GET_KEY);$i++)  
{  
$real_get[$i] = $_GET[$GET_KEY[$i]];  
$_GET[$GET_KEY[$i]] = str_replace($sql_inject_1, $sql_inject_2, HtmlSpecialChars($_GET[$GET_KEY[$i]]));  
if($real_get[$i] != $_GET[$GET_KEY[$i]])  
{  
fwrite ($fp, "IP: $ip\r\n");  
fwrite ($fp, "Method: GET\r\n");  
fwrite ($fp, "Value: $real_get[$i]\r\n");  
fwrite ($fp, "Script: $script\r\n");  
fwrite ($fp, "Time: $time\r\n");  
fwrite ($fp, "==================================\r\n");  
}  
}  
/*end clear $_GET */  
/*begin clear $_POST */  
for($i=0;$i<count($POST_KEY);$i++)  
{  
$real_post[$i] = $_POST[$POST_KEY[$i]];  
$_POST[$POST_KEY[$i]] = str_replace($sql_inject_1, $sql_inject_2, HtmlSpecialChars($_POST[$POST_KEY[$i]]));  
if($real_post[$i] != $_POST[$POST_KEY[$i]])  
{  
fwrite ($fp, "IP: $ip\r\n");  
fwrite ($fp, "Method: POST\r\n");  
fwrite ($fp, "Value: $real_post[$i]\r\n");  
fwrite ($fp, "Script: $script\r\n");  
fwrite ($fp, "Time: $time\r\n");  
fwrite ($fp, "==================================\r\n");  
}  
}  
/*end clear $_POST */  
/*begin clear $_COOKIE */  
for($i=0;$i<count($COOKIE_KEY);$i++)  
{  
$real_cookie[$i] = $_COOKIE[$COOKIE_KEY[$i]];  
$_COOKIE[$COOKIE_KEY[$i]] = str_replace($sql_inject_1, $sql_inject_2, HtmlSpecialChars($_COOKIE[$COOKIE_KEY[$i]]));  
if($real_cookie[$i] != $_COOKIE[$COOKIE_KEY[$i]])  
{  
fwrite ($fp, "IP: $ip\r\n");  
fwrite ($fp, "Method: COOKIE\r\n");  
fwrite ($fp, "Value: $real_cookie[$i]\r\n");  
fwrite ($fp, "Script: $script\r\n");  
fwrite ($fp, "Time: $time\r\n");  
fwrite ($fp, "==================================\r\n");  
}  
}  

/*end clear $_COOKIE */  
fclose ($fp);  
?>
<?php

/* 
 * Etunia Voting System Lite
 * Copyright 2009, Kimmy Andersson.
 * 
 */

if(isset($_POST['doVote']))
{
	
	include_once("class/class.vote.php");
	include_once("inc/inc.class_initiate.php");
	include_once("inc/inc.config.php");
	
	$mssqlcon = mssql_connect($mssqlServer, $mssqlUser, $mssqlPass);
	
	$eVoteHEAD = "Error!";
	
	if($_POST['etCharacter'] && $eVote->checkIP() && $eVote->checkCharacter($_POST['etCharacter']))
	{
		
		$eVote->removeLog($_POST['etCharacter']);
		
		$itemSendResult = $eVote->sendItem($_POST['etCharacter'], $_POST['etItem']);
		
		if($itemSendResult)
		{
			
			$eVoteHEAD = "Link generated!";

			$eVoteMSG = "<style type= text/css >
<!--
.style1 {
	color: #333333;
	font-family: Arial, Helvetica, sans-serif;

}
-->
</style>
</head>

<body>
<table width= 540  border= 0  align= center  cellpadding= 0  cellspacing= 0 >
  <!--DWLayoutTable-->
  <tr>
    <td width= 540  height= 88 >&nbsp;</td>
  </tr>
  <tr>
    <td height= 211  valign= top  bgcolor= #FFFFCC > <div align= center >
      <p>&nbsp;</p>
      <p>&nbsp;</p>
      <p class= style1 ><span class= style2 ><a href=\"javascript:etOpenVoteWindow()\">Click&nbsp;here</a></span>&nbsp;to open the vote window.<br />
        The reward will be sent to you after you voted.<br />
        If it doesn't appear however, try relogging. </p>
    </div></td>
  </tr>
  <tr>
    <td height= 71 >&nbsp;</td>
  </tr>
</table>
</body>";
		}
		else
			$eVoteMSG = "<!DOCTYPE html PUBLIC   -//W3C//DTD XHTML 1.0 Transitional//EN     http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd  >
<html xmlns=  http://www.w3.org/1999/xhtml  >
<head>
<meta http-equiv=  Content-Type   content=  text/html; charset=iso-8859-1   />
<title>Untitled Document</title>
<style type=  text/css  >
<!--
.style3 {
	font-size: 12px;
	font-family: Arial, Helvetica, sans-serif;
}
-->
</style>
</head>

<body>
<table width=  540   border=  0   align=  center   cellpadding=  0   cellspacing=  0  >
  <!--DWLayoutTable-->
  <tr>
    <td width=  540   height=  88  >&nbsp;</td>
  </tr>
  <tr>
    <td height=  111   valign=  top   bgcolor=  #FEBABC  > <div align=  center  >
      <p>&nbsp;</p>
        <p class=  style3  ><strong>Opss!</strong>   The character doesn't exist!<br />
        Please refresh the browser and try again. </p>
    </div></td>
  </tr>
  <tr>
    <td height=  119  >&nbsp;</td>
  </tr>
</table>
</body>
</html>
";
		
	}
	else
		$eVoteMSG = "<!DOCTYPE html PUBLIC   -//W3C//DTD XHTML 1.0 Transitional//EN     http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd  >
<html xmlns=  http://www.w3.org/1999/xhtml  >
<head>
<meta http-equiv=  Content-Type   content=  text/html; charset=iso-8859-1   />
<title>Untitled Document</title>
<style type=  text/css  >
<!--
.style3 {
	font-size: 12px;
	font-family: Arial, Helvetica, sans-serif;
}
-->
</style>
</head>

<body>
<table width=  540   border=  0   align=  center   cellpadding=  0   cellspacing=  0  >
  <!--DWLayoutTable-->
  <tr>
    <td width=  540   height=  88  >&nbsp;</td>
  </tr>
  <tr>
    <td height=  111   valign=  top   bgcolor=  #FEBABC  > <div align=  center  >
      <p>&nbsp;</p>
        <p class=  style3  ><strong>Opss!</strong> Either you left the character field blank, or you are trying to vote from the same <br>
        character more than once within 12 hours.Please refresh the browser and try again.</p>
    </div></td>
  </tr>
  <tr>
    <td height=  119  >&nbsp;</td>
  </tr>
</table>
</body>
</html>
";
	
	echo("<p>{$eVoteHEAD}</p>{$eVoteMSG}");
	
}
else
{
	
	
	
	include_once("vote/inc/inc.config.php");
	include_once("vote/class/class.vote.php");
	include_once("vote/inc/inc.class_initiate.php");
	
	
	$mssqlcon = mssql_connect($mssqlServer, $mssqlUser, $mssqlPass);
	
		if($eVote->checkIP())
	{
		
		?>
		<script  src="vote/js/jquery.js"></script>
		<script  src="vote/js/vote.js"></script>
		
		<div id="et_vbutton" onclick="etLiteGetVoteDialog();" style="background-image: url('vote/images/votenow.png'); text-align: center; width: 250px; height: 150px; position: absolute; top: 0px; right: 20px; cursor: pointer;">
			
			<div id="et_vcharenter" style="background-color: #F8F8F8; margin: 10px auto; width: 200px; height: 100px; text-align: center; display: none;">
				
				Character Name:<br/>
				<input type="text" id="etCharField"/><br/>
				
				<select name="etItemField" id="etItemField">
					
			    	<option value="2">(2500) Pcs- Red Chips</option>
				
				<option value="4">(50) Pcs- Perin</option>
				<option value="5">(99) Pcs- Remantis Laccotte</option>
				<option value="6">(5) Pcs- Scroll of Velocity</option>
					
				</select><br/>
				<input type="submit" id="etCharSubmit" onclick="etLiteDoVoteDialog();" value="VoteNow"/>
				
			</div>
			
		</div>
		
		<?php
		
	}
	
}

?>
any suggestions, know how to fix this?

any help -.-