database values to have different color in jsp program

i have a calendar program in jsp. The dates with the description are getting inserted into the database.
My problem is, the inserted date should have a different color. To achieve this, what should i do?
Another problem is, i have created a tooltip. But its not working.
can anyone please help me with the code.

<%@ page import="java.util.List"%>
<%@page import="java.sql.*, java.util.*, java.text.*" %> 
<%@page import="java.sql.Connection, java.sql.DriverManager,java.sql.ResultSet,java.sql.SQLException" %>
 
<html> 
<head>
<title>Print a month page.</title>
<meta name="version">
  
<script>
var lastId = "";
var curId  = "";
 
function selectDate(f)
 {
if(document.forms[0].lastDateId != null) 
{
lastId = document.forms[0].lastDateId.value;
}

if(lastId != document.forms[0].todayId.value) 
{
  if(document.getElementById(lastId).title == "") 
  {
   document.getElementById(lastId).style.backgroundColor='white';
  }
}

if(f.id != document.forms[0].todayId.value) 
  {
   document.getElementById(f.id).style.backgroundColor='blue';
        }

</script>
 
</head>
 
<body bgcolor="#c6d9e4">
 
<%
Connection con = null;
response.setContentType("text/html");
 
    try 
      {
           String driverName = "com.mysql.jdbc.Driver"; 
       Class.forName(driverName);
    
            String serverName = "192.168.10.5";
        String mydatabase = "Trainees";
        String url = "jdbc:mysql://" + serverName +  "/" + mydatabase; 
        String username = "venkat";
        String password = "venkat";
        con = DriverManager.getConnection(url, username, password);
        
        Statement stmt = null;
        ResultSet rset = null;
        PreparedStatement PREPstmt1;
 
        stmt = con.createStatement();
 
      String year = request.getParameter("year");
      out.println("year value is : "+year);
 
      String date="",descr="";
String list = request.getParameter("list");

if(list != null) 
{
String dateDescrList[] = list.split(",");

for(int i=0;i<dateDescrList.length;i++) 
{
String listObj = dateDescrList[i];
             if(!listObj.equals("") || !listObj.trim().equals("")) 
{
                 date= year+"-"+listObj.substring(0,listObj.indexOf(":"));
descr = listObj.substring(listObj.indexOf(":")+1);
 
out.println("date is : "+date);
out.println("description is : "+descr);
                 }
 
String query  = "insert into Holiday(HolidayDate, Description, Weekender) VALUES (?, ?, 'N')";
              
         PREPstmt1=con.prepareStatement(query);
               PREPstmt1.setString(1,date);
             PREPstmt1.setString(2,descr);
             PREPstmt1.executeUpdate(); 
             
           }
        }
      }
       
   
catch(Exception e)
 {
      System.err.println("Exception: " + e.getMessage());
 }
 finally 
{
       try 
     {
        if(con != null)
          con.close();
     } 
      catch(SQLException e) 
     {
     }
}
%>

This is how i insert the data into database. what should i do to check the dates are available in database and then color it.
The function setTitle() does the tooltip part, but is it correct?
please help with the code.

Moved to the HTML forum.